đề số 07 Chọn phơng án ( a hoặc b, c, d) ứng với từ có trọng âm chính nhấn vào âm tiết có vị trí khác với ba từ còn lại trong câu: 1. a. atmosphere b. oxygen c. release d. fertilize 2. a. contaminate b. garbage c. eruption d. Familiar 3. a. serious b. chemical c. influence d. occur 4. a. vapour b. contain c. Supply d. Disposal 5. a. concentration b. dangerous c. combination d. guarantee Đọc kỹ đoạn văn sau và chọn phơng án đúng (a hoặc b, c, d) cho mỗi chỗ trống . Although women now have the freedom to ( 6).whether or not they have children, it is generally a joint decision between the partners involved. In fact, in cultured which ( 7).strongly traditional , the decision to have a baby may well be ( 8).by society, family and the man of the family, rather than the mother. Furthermore, in most modern societies, with (9).expectations from both men and women , there is an obvious need for major decisions, such as starting a family. Thus it is unreasonable to suggest that women are solely responsible for the decision to have a child, and therefore it is unreasonable that they are responsible for ( 10).the child up. 6. a. select b. elect c. choose d. know 7. a. stay b. remain c. keep d. become 8. a. infected b. affected c. done d. finished 9. a. raising b. decreasing c. arising d. increasing 10. a. bringing b. educating c. raising d. keeping Chọn phơng án ( a hoặc b , c, d) ứng với từ / cụm từ có gạch chân cần phải sửa để các câu s au trở thành câu đúng: 11. Many ( A) opinions have been voiced (B) on its ( C) likely effects of computer(D). 12. Goasts are( A)extremely destructive(B)to natural vegetation and are often responsible for soil erode( D). 13. Had finished (A) their (B) super, the boys( C) went out to play(D). 14. She (A) learns(B) German( C) for two years(D). 15. Married women are twice (A) so (B) likely as married men (C) to be depressed(D). 16. When (A) a human beings walks, he or (B) she exerts a certain number of (C) force on (D) the ground. 17. The oceans (A) contain many forms (B) of life that has (C) not yet (D) been discovered. 18. There have recently (A) been any (B) important findings (C) in medical technology (D). 19. John usually play (A) tennis once (B) or (C) twice (D) a week. 20. Many disabled (A) children cannot derive (B) full enjoyment (C) from toys make (D) for non- disabled children. Chọn phơng án đúng ( a hoặc b, c, d) để hoàn thành mỗi câu sau: 21. He is used to early in the morning. a. get up b. gets up c. got up d. getting up 22. It is very difficult for us toour bad habits. a. get through b. put out c. over come d. set off 23. My teacher always gives us a clear a. explain b. explained c. explanatory d. explanation 24. Dont drink.wine. Its bad for your health. a. many of b. a few of c. so much d. many 25. She had workedshe made herself ill. a. such hard that b. such hardly that c. so hardly that d. so hard that 26. We are very about our chances of success. a. afraid b. keen c. familiar d. sanguine 27. Learning English is.for young people to get a good job. a. difficult b. hard c. necessary d. unnecessary. 28. Millions of people all over the world English as their native language. a. have b. talk c. choose d. produce 29.Approaching.the village, we saw the village common in the distance. a. at b. in c. to d. ỉ 30. Teenagers have had physical changes during the from childhood to adult life. a. transition b. exchange c. way d. growth 31. many people believe that natural resources will never be. a. used out b. used up c. used off d. used away 32. The pilot managed tothe damaged plane safely. a. take off b. take on c. launch d. land 33. I regret you that we cannot approve your application. a. inform b. to inform c. informed d. informing 34. Not only air pollution but is also does harm to our health. a. car exhaust cause b. car exhaust causes c. does car exhaust cause d. do car exhaust cause 35. Interpol is combined from the two words. a. internet and pole b. internet and police c. international and pole d. international and police 36. Theyby the time we a. had finished working / came b. had finished to work / come c. finished working / had come d. have finished work / will come 37. Computer science is.many other sciences. a. outplaying b. outnumbering c. outgrowing d. outdating 38. The government the flood victims with food, clothes and money. a. gave b. provided c. offered d. carried 39. Most of the Vietnamese people save money and keep gold for a. future use b. using in the future c. will be use in the future d. a and b 40. Feeling sleepy, the driver stopped.a coffee. a. to drink b. drank c. drinking d. drunk Chọn phơng án ( a hoặc b , c , d) ứng với các câu tốt nhất đợc tạo ra bằng những từ cho sẵn 41. it / Net / I / time / but / have / I / dont / enjoy / surfing. a. I enjoy surfing the Net but I dont have much time for it. b. I enjoy surfing on the Net but I dont have much time for it. c. I enjoy surfing in the net but I dont have much time for it. d. I enjoy surfing on Net but I dont have much time for it. 42. prints / collection / have / colour / 19 th century / rare / my father. a. my father has rare collection of 19 th century colour prints. b. My father has rare collection in 19 th century colour prints. c. My father has a rare collection of 19 th century colour prints. d. My father has a rare collection in 19 th century colour prints. 43. her / scientist / eager / be / experiment / results / analyze. a. The scientist was eager to analyze the results on her experiment. b. Scientist was eager to analyze the results of her experiment. c. The scientist was eager to analyze the results of her experiment. d. The scientist was eager analyze the results of her experiment. 44. eight hours / John / be / old / work / a day / enough. a. John is old enough to work eight hours a day. b. John is old enough working eight hours a day. c. John is enough old working eight hours a day d. John is enough old to work eight hours a day. 45. She / has / house / yesterday / paint. a. She has her house painted yesterday. b. She had her house paint yesterday c. She had her house painting yesterday d. She had her house painted yesterday. Đọc kĩ đoạn văn sau và chọn phơng án đúng ( a hoặc b, c, d) cho mỗi chỗ trống: Revising for exams is not as easy as it looks. You will need to work out which routine suits you best, and ( 46).stick to it. Some people like studying at night when its quiet, whereas others find the early morning is a ( 47) time to get things done. You might enjoy ( 48).to music ( 49).you revise, but this can be ( 50) Can you really concentrate (51) two things at once? So think ( 52) .you turn your radio on. Your ( 53).is also important while you are revising. This may be a more than usually( 54) period of your life, when you ( 55) take extra care to eat properly. No missed meals, or junk food, or ( 56) cupsof coffee! Get plenty of exercise as well. If you have got fed up with ( 57).youre doing, or find it hard to concentrate, go for a walk to clear your head. ( 58).exercise will help to keep your body fit and your brain working ( 59). Finally, you also ( 60) to take time off. Go out occasionally, see your friends, make time to relax. Then you will return to your studies fresh and full of enthusiasm. 46. a. then b. than c.after d. often 47. a. best b.good c. worse d. well 48. a. to listen b. having listened c. listen d. listening 49. a. during b. while c. however d. through out 50. a. unhelpful b. helpful c. helpless d. helping 51. a. on b. in c. of d. for 52. unless b. if c. before d. after 53. a. slim b. diet c. Healthy d. menu 54. a. stressy b.stressed c. stressing d. stressful 55. a. should b. ought c. need d. might 56. a. worthless b. hopeless c. restless d. endless 57. a. which b. what c. that d. who 58. a. Strongly b. Every c. Regular d. Always 59. a. well b. energetic c. good d. correct 60. a. must b. should c. need d. may Chọn phơng án ( a hoặc b, c, d) ứng với câu có nghĩa gần nhất với mỗi câu cho sẵn sau đây 61. Dont tell anyone or youll be sorry. a. She said she was sorry as I didnt tell her b. She warned me not to tell anyone. c. I would be sorry if she didnt tell me. d. She said that I should apologise to her 62. Junia forgot to do her homework. a. Junia did her homework but she didnt remember. B. Julia forgot doing her homework. c. Julia didnt do her homework as she didnt remember d. Somebody did her homework for Julia but she forgot it. 63. I dont mind at all if you use my typewriter. Go ahead a. She allowed me to use her typewriter b.She said I could use her typewriter if she went away c. I was forbidden to use her typewriter, and I should go. D. She told me to go ahead. 64. We cant deny that all of us made certain mistakes early on. a. It can be denied that not all of us made mistakes b. It is true that nobody could avoid making mistakes c. We admit that we could avoid making certain mistakes when young. d. Everyone of us denies that we made certain mistakes early on. 65. The agreement ended six- month negotiation. It was signed yesterday. a. The agreement which ended six- month negotiation was signed yesterday. b. The agreement which was signed yesterday lasted six months. c. The negotiation which lasted six months was signed yesterday. d. The agreement which was signed yesterday ended six- month negotiation. Đọc kĩ đoạn văn sau và chọn phơng án đúng ( a hoặc b, c, d) cho mỗi chỗ câu: The main topic of last weeks meeting was suggestion boxes. All departments in the factory are to have conspicuously labeled suggestion boxes. At the meeting, it was obvious that the employees suggestion would not only save the company money, but would do much to lift morale and streamline production. To further this process, the suggestion box idea was adopted. Forms for the suggestions are to be kept inside the box. When employees fill out a form, they should clearly state which situation they are trying to improve, list all pertinent data, and then offer a solution, stating how the company would benefit. Forms will then be collected each month by the department heads, who will then pass them on to the plant manager will consult with the respective departments to gather any relevant data. If applicable, the matter will then be passed on to the finance department for approval. A bonus will be paid to employees for any suggestions that are adopted. The amount of the bonus will be commensurate with the saving to the company. 66. Why has the company decided to use suggestion boxes? a. To take advantages of the employees ideas. B. To minimize complaints. c. To take some of the burden off department heads. D. To appease the finance department. 67. What is the topic of the report? a. meeting b. morale c. production d. a new system 68. How do the employees get the suggestion slips? a. By requesting them from department heads. B. By applying to the plant manager. c. by looking in the suggestion box itself. D. by asking the director of finance 69. What, specially, should employees include in their suggestions? a. the duration of the problem b. what they would consider to be an appropriate bonus. c. The names of troublesome coworkers, d. A description of the point they are trying to remedy. 70. What is the plant manager supposed to do? a. Reviewing each suggestion with the employee. B. Route all suggestions through the finance department. c. Compile data from other areas. D. issue bonus checks. Chọn phơng án ( a hoặc b ,c ,d) ứng với từ có phần gạch chân phát âm khác với cá từ còn lại: 71. a. engine b. wine c. decline d. design 72. a. pleasant b. husband c. secondhandd. important 73. a. pollute b. polite c. possible d. police 74. a. waste b. vast c. Broadcast d. nasty 75. a. emission b. poison c. miss d. boss Đọc kĩ đoạn văn sau và chọn phơng án đúng ( a hoặc b, c, d) cho mỗi chỗ câu: Scientists claim that air pollution causes a decline in the worlds average air temperature. In order to prove that theory , ecologists have turned to historical data in relation to especially huge volcanic eruptions. They suspect that volcanoes effect weather changes that are similar to air pollution. One source of information is the effect of the eruption of Tambora, a volcano in Sumbawa, the Dutch East Indies, in April 1815. the largest recorded volcanic eruption, tambora threw 150 million tons of fine ash into the stratosphere. The ash from a volcano spread worldwide in a few days and remains in the air for years. Its effect is to turn incoming solar radiation into space and thus cool the earth. For example, records of weather in England show that between April and November 1815, the average temperature had fallen 4.5oF. During the next twenty four months , England suffered one of the coldest periods of its history. Farmers records from April 1815 to Decenver 1818 indicate frost through out the spring and summer and sharp decrease in crop and livestock markets. Since there was a time lag of several years between cause and effect, by the time the world agriculture commodity community had deteriorated, no one realized the cause. Ecologist today warn that we face a twofold menace. The ever-present possibility of volcanic eruptions, such as that of Mt. St. Helens in Washington, added to mans pollution of the atmosphere with oil, gas, coal and other polluting substances, may bring us increasingly colder weather. 76. It is believed that the earth get colder when a. volcanoes erupt b. the air is polluted by modern man c. the rays of the sun are turned into space. D. all of the above 77. The effects of Tamboras eruption were a. felt mainly in the Dutch East Indies b. of several daysduration worldwide. c. evidence of pollutions cooling the earth. d. immediately evident to the worlds scientist. 78. The cause of cold weather in England from 1815 to 1818 was a. decreased crop and livestock production b. volcanic ash in the atmosphere c. pollution caused by the Industrial Revolution d. its proximity to the North Sea 79. No one realize the cause of the deterioration of the world agricultural commodity market because a. there was a long delay between cause and effect b. the weather is beyond our comprehension c. weather forecasts were inaccurate d. ecologists didnt exist until modern times. 80. If, as some scientist predict , the world ends in ice, what might be the cause? a. modern man s pollution of the air b. volcanic eruptions c. obliteration of solar radiation d. all of the above. đề số 07 Chọn phơng án ( a hoặc b, c, d) ứng với từ có trọng âm chính nhấn vào âm tiết có vị trí khác với ba từ còn lại trong câu: 1. a. atmosphere b. oxygen c. release d. fertilize 2. a. contaminate b. garbage c. eruption d. Familiar 3. a. serious b. chemical c. influence d. occur 4. a. vapour b. contain c. Supply d. Disposal 5. a. concentration b. dangerous c. combination d. guarantee Đọc kỹ đoạn văn sau và chọn phơng án đúng (a hoặc b, c, d) cho mỗi chỗ trống . Although women now have the freedom to ( 6).whether or not they have children, it is generally a joint decision between the partners involved. In fact, in cultured which ( 7).strongly traditional , the decision to have a baby may well be ( 8).by society, family and the man of the family, rather than the mother. Furthermore, in most modern societies, with (9).expectations from both men and women , there is an obvious need for major decisions, such as starting a family. Thus it is unreasonable to suggest that women are solely responsible for the decision to have a child, and therefore it is unreasonable that they are responsible for ( 10).the child up. 6. a. select b. elect c. choose d. know 7. a. stay b. remain c. keep d. become 8. a. infected b. affected c. done d. finished 9. a. raising b. decreasing c. arising d. increasing 10. a. bringing b. educating c. raising d. keeping Chọn phơng án ( a hoặc b , c, d) ứng với từ / cụm từ có gạch chân cần phải sửa để các câu s au trở thành câu đúng: 11. Many ( A) opinions have been voiced (B) on its ( C) likely effects of computer(D). 12. Goasts are( A)extremely destructive(B)to natural vegetation and are often responsible for soil erode( D). 13. Had finished (A) their (B) super, the boys( C) went out to play(D). 14. She (A) learns(B) German( C) for two years(D). 15. Married women are twice (A) so (B) likely as married men (C) to be depressed(D). 16. When (A) a human beings walks, he or (B) she exerts a certain number of (C) force on (D) the ground. 17. The oceans (A) contain many forms (B) of life that has (C) not yet (D) been discovered. 18. There have recently (A) been any (B) important findings (C) in medical technology (D). 19. John usually play (A) tennis once (B) or (C) twice (D) a week. 20. Many disabled (A) children cannot derive (B) full enjoyment (C) from toys make (D) for non- disabled children. Chọn phơng án đúng ( a hoặc b, c, d) để hoàn thành mỗi câu sau: 21. He is used to early in the morning. a. get up b. gets up c. got up d. getting up 22. It is very difficult for us toour bad habits. a. get through b. put out c. over come d. set off 23. My teacher always gives us a clear a. explain b. explained c. explanatory d. explanation 24. Dont drink.wine. Its bad for your health. a. many of b. a few of c. so much d. many 25. She had workedshe made herself ill. a. such hard that b. such hardly that c. so hardly that d. so hard that 26. We are very about our chances of success. a. afraid b. keen c. familiar d. sanguine 27. Learning English is.for young people to get a good job. a. difficult b. hard c. necessary d. unnecessary. 28. Millions of people all over the world English as their native language. a. have b. talk c. choose d. produce 29.Approaching.the village, we saw the village common in the distance. a. at b. in c. to d. ỉ 30. Teenagers have had physical changes during the from childhood to adult life. a. transition b. exchange c. way d. growth 31. many people believe that natural resources will never be. a. used out b. used up c. used off d. used away 32. The pilot managed tothe damaged plane safely. a. take off b. take on c. launch d. land 33. I regret you that we cannot approve your application. a. inform b. to inform c. informed d. informing 34. Not only air pollution but is also does harm to our health. a. car exhaust cause b. car exhaust causes c. does car exhaust cause d. do car exhaust cause 35. Interpol is combined from the two words. a. internet and pole b. internet and police c. international and pole d. international and police 36. Theyby the time we a. had finished working / came b. had finished to work / come c. finished working / had come d. have finished work / will come 37. Computer science is.many other sciences. a. outplaying b. outnumbering c. outgrowing d. outdating 38. The government the flood victims with food, clothes and money. a. gave b. provided c. offered d. carried 39. Most of the Vietnamese people save money and keep gold for a. future use b. using in the future c. will be use in the future d. a and b 40. Feeling sleepy, the driver stopped.a coffee. a. to drink b. drank c. drinking d. drunk Chọn phơng án ( a hoặc b , c , d) ứng với các câu tốt nhất đợc tạo ra bằng những từ cho sẵn 41. it / Net / I / time / but / have / I / dont / enjoy / surfing. a. I enjoy surfing the Net but I dont have much time for it. b. I enjoy surfing on the Net but I dont have much time for it. c. I enjoy surfing in the net but I dont have much time for it. d. I enjoy surfing on Net but I dont have much time for it. 42. prints / collection / have / colour / 19 th century / rare / my father. a. my father has rare collection of 19 th century colour prints. b. My father has rare collection in 19 th century colour prints. c. My father has a rare collection of 19 th century colour prints. d. My father has a rare collection in 19 th century colour prints. 43. her / scientist / eager / be / experiment / results / analyze. a. The scientist was eager to analyze the results on her experiment. b. Scientist was eager to analyze the results of her experiment. c. The scientist was eager to analyze the results of her experiment. d. The scientist was eager analyze the results of her experiment. 44. eight hours / John / be / old / work / a day / enough. a. John is old enough to work eight hours a day. b. John is old enough working eight hours a day. c. John is enough old working eight hours a day d. John is enough old to work eight hours a day. 45. She / has / house / yesterday / paint. a. She has her house painted yesterday. b. She had her house paint yesterday c. She had her house painting yesterday d. She had her house painted yesterday. Đọc kĩ đoạn văn sau và chọn phơng án đúng ( a hoặc b, c, d) cho mỗi chỗ trống: Revising for exams is not as easy as it looks. You will need to work out which routine suits you best, and ( 46).stick to it. Some people like studying at night when its quiet, whereas others find the early morning is a ( 47) time to get things done. You might enjoy ( 48).to music ( 49).you revise, but this can be ( 50) Can you really concentrate (51) two things at once? So think ( 52) .you turn your radio on. Your ( 53).is also important while you are revising. This may be a more than usually( 54) period of your life, when you ( 55) take extra care to eat properly. No missed meals, or junk food, or ( 56) cupsof coffee! Get plenty of exercise as well. If you have got fed up with ( 57).youre doing, or find it hard to concentrate, go for a walk to clear your head. ( 58).exercise will help to keep your body fit and your brain working ( 59). Finally, you also ( 60) to take time off. Go out occasionally, see your friends, make time to relax. Then you will return to your studies fresh and full of enthusiasm. 46. a. then b. than c.after d. often 47. a. best b.good c. worse d. well 48. a. to listen b. having listened c. listen d. listening 49. a. during b. while c. however d. through out 50. a. unhelpful b. helpful c. helpless d. helping 51. a. on b. in c. of d. for 52. unless b. if c. before d. after 53. a. slim b. diet c. Healthy d. menu 54. a. stressy b.stressed c. stressing d. stressful 55. a. should b. ought c. need d. might 56. a. worthless b. hopeless c. restless d. endless 57. a. which b. what c. that d. who 58. a. Strongly b. Every c. Regular d. Always 59. a. well b. energetic c. good d. correct 60. a. must b. should c. need d. may Chọn phơng án ( a hoặc b, c, d) ứng với câu có nghĩa gần nhất với mỗi câu cho sẵn sau đây 61. Dont tell anyone or youll be sorry. a. She said she was sorry as I didnt tell her b. She warned me not to tell anyone. c. I would be sorry if she didnt tell me. d. She said that I should apologise to her 62. Junia forgot to do her homework. a. Junia did her homework but she didnt remember. B. Julia forgot doing her homework. c. Julia didnt do her homework as she didnt remember d. Somebody did her homework for Julia but she forgot it. 63. I dont mind at all if you use my typewriter. Go ahead a. She allowed me to use her typewriter b.She said I could use her typewriter if she went away c. I was forbidden to use her typewriter, and I should go. D. She told me to go ahead. 64. We cant deny that all of us made certain mistakes early on. a. It can be denied that not all of us made mistakes b. It is true that nobody could avoid making mistakes c. We admit that we could avoid making certain mistakes when young. d. Everyone of us denies that we made certain mistakes early on. 65. The agreement ended six- month negotiation. It was signed yesterday. a. The agreement which ended six- month negotiation was signed yesterday. b. The agreement which was signed yesterday lasted six months. c. The negotiation which lasted six months was signed yesterday. d. The agreement which was signed yesterday ended six- month negotiation. Đọc kĩ đoạn văn sau và chọn phơng án đúng ( a hoặc b, c, d) cho mỗi chỗ câu: The main topic of last weeks meeting was suggestion boxes. All departments in the factory are to have conspicuously labeled suggestion boxes. At the meeting, it was obvious that the employees suggestion would not only save the company money, but would do much to lift morale and streamline production. To further this process, the suggestion box idea was adopted. Forms for the suggestions are to be kept inside the box. When employees fill out a form, they should clearly state which situation they are trying to improve, list all pertinent data, and then offer a solution, stating how the company would benefit. Forms will then be collected each month by the department heads, who will then pass them on to the plant manager will consult with the respective departments to gather any relevant data. If applicable, the matter will then be passed on to the finance department for approval. A bonus will be paid to employees for any suggestions that are adopted. The amount of the bonus will be commensurate with the saving to the company. 66. Why has the company decided to use suggestion boxes? a. To take advantages of the employees ideas. B. To minimize complaints. c. To take some of the burden off department heads. D. To appease the finance department. 67. What is the topic of the report? a. meeting b. morale c. production d. a new system 68. How do the employees get the suggestion slips? a. By requesting them from department heads. B. By applying to the plant manager. c. by looking in the suggestion box itself. D. by asking the director of finance 69. What, specially, should employees include in their suggestions? a. the duration of the problem b. what they would consider to be an appropriate bonus. c. The names of troublesome coworkers, d. A description of the point they are trying to remedy. 70. What is the plant manager supposed to do? a. Reviewing each suggestion with the employee. B. Route all suggestions through the finance department. c. Compile data from other areas. D. issue bonus checks. Chọn phơng án ( a hoặc b ,c ,d) ứng với từ có phần gạch chân phát âm khác với cá từ còn lại: 71. a. engine b. wine c. decline d. design 72. a. pleasant b. husband c. secondhand d. important 73. a. pollute b. polite c. possible d. police 74. a. waste b. vast c. Broadcast d. nasty 75. a. emission b. poison c. miss d. boss Đọc kĩ đoạn văn sau và chọn phơng án đúng ( a hoặc b, c, d) cho mỗi chỗ câu: Scientists claim that air pollution causes a decline in the worlds average air temperature. In order to prove that theory , ecologists have turned to historical data in relation to especially huge volcanic eruptions. They suspect that volcanoes effect weather changes that are similar to air pollution. One source of information is the effect of the eruption of Tambora, a volcano in Sumbawa, the Dutch East Indies, in April 1815. the largest recorded volcanic eruption, tambora threw 150 million tons of fine ash into the stratosphere. The ash from a volcano spread worldwide in a few days and remains in the air for years. Its effect is to turn incoming solar radiation into space and thus cool the earth. For example, records of weather in England show that between April and November 1815, the average temperature had fallen 4.5oF. During the next twenty four months , England suffered one of the coldest periods of its history. Farmers records from April 1815 to Decenver 1818 indicate frost through out the spring and summer and sharp decrease in crop and livestock markets. Since there was a time lag of several years between cause and effect, by the time the world agriculture commodity community had deteriorated, no one realized the cause. Ecologist today warn that we face a twofold menace. The ever-present possibility of volcanic eruptions, such as that of Mt. St. Helens in Washington, added to mans pollution of the atmosphere with oil, gas, coal and other polluting substances, may bring us increasingly colder weather. 76. It is believed that the earth get colder when a. volcanoes erupt b. the air is polluted by modern man c. the rays of the sun are turned into space. D. all of the above 77. The effects of Tamboras eruption were a. felt mainly in the Dutch East Indies b. of several daysduration worldwide. c. evidence of pollutions cooling the earth. d. immediately evident to the worlds scientist. 78. The cause of cold weather in England from 1815 to 1818 was a. decreased crop and livestock production b. volcanic ash in the atmosphere c. pollution caused by the Industrial Revolution d. its proximity to the North Sea 79. No one realize the cause of the deterioration of the world agricultural commodity market because a. there was a long delay between cause and effect b. the weather is beyond our comprehension c. weather forecasts were inaccurate d. ecologists didnt exist until modern times. 80. If, as some scientist predict , the world ends in ice, what might be the cause? a. modern man s pollution of the air b. volcanic eruptions c. obliteration of solar radiation d. all of the above. . to get things done. You might enjoy ( 48).to music ( 49).you revise, but this can be ( 50) Can you really concentrate (51) two things at once? So think. to get things done. You might enjoy ( 48).to music ( 49).you revise, but this can be ( 50) Can you really concentrate (51) two things at once? So think