3 BT ANH 7 (bui van vinh)

BÙI VĂN VINH (Chủ biên) DƯƠNG THỊ HỒNG ĐIỆP BÀI TẬP TIẾNG ANH LỚP CÓ ĐÁP ÁN (Theo chương trình Tiếng Anh Bộ giáo dục Đào tạo) NHÀ XUẤT BẢN ĐẠI HỌC QUỐC GIA HÀ NỘI Lời nói đầu Sách Bài tập Tiếng Anh lớp dựa vào phương pháp dạy ngôn ngữ giao tiếp (Communicative Language Teaching Method) Sách tập trung vào việc phát triển kỹ ngôn ngữ cho học sinh Trung học sở thông qua dạng bổ ích, tập trung vào luyện ngữ âm, từ vựng, kỹ đọc hiểu, viết sử dụng ngôn ngữ tổng hợp thông qua kiểm tra (Tests), giúp cho người học có khả tổng hợp kiến thức hiệu Mỗi học sách Bài tập Tiếng Anh lớp 7được biên soạn theo chủ điểm quen thuộc với học sinh Trung học sở Mỗi đơn vị học chia thành mục lớn sau: PART 1: GRAMMAR REVIEW PART 2: EXERCISES A PHONETICS B VOCABULARY AND GRAMMAR C READING D WRITING PART 3: TEST YOURSELF SáchBài tập Tiếng Anh lớp 7được biên soạn dựa thực tiễn việc dạy học tiếng Anh Đây nguồn tài liệu tham khảo bổ ích cho giáo viên học sinh thiết thực giao lưu quốc tế nhằm nâng cao khả sử dụng ngôn ngữ tiếng Anh thời kỳ hội nhập Tác giả mong nhận ý kiến đóng góp nhà giáo, đồng nghiệp, phụ huynh học sinh độc giả quan tâm để sách ngày hoàn thiện Trân trọng! Unit MY HOBBIES PART 1: GRAMMAR REVIEW The present simple (Thìhiệntạiđơn): (Diễntảhànhđộngsựviệcxảyratheothóiquen, thườngxunxảyrahoặclặpđilặplại hiệntại) The present simple is often used with the following words and phrases: - Adverbs: always, usually, often, sometimes, rarely, never - Phrases: every Monday/ week/ etc each Monday/ week/ etc once/ twice a week/ month/ etc three times a week/ month/ etc Note: Remember that these adverbs usually go before the verb, but after the verb “To be” Ex: I often play football with my friends I am often late for my piano lessons The future simple (Thìtươnglaiđơn): (Diễntảhànhđộngsựviệcsẽxảyratrongtươnglai; sựtiênđốn; lờiđềnghị hayucầuhoặcnhữngquyếtđịnh thờiđiểmhiệntại) -Express facts about the future: The new airport will be the biggest in Europe - Express predictions: You’ll have a great time in Ha Long Bay - Express offers or requests: We’ll help you get ready for your holiday - Express decisions made now: I know! I’ll go to China this summer Love/ like/ hate and enjoy: We can use the verbs “like”, “love”, “hate” and “enjoy” to explain our likes and dislikes: Ex: - I love chocolate - He likes classical music If we use a verb, it must be in the “-ing” form: Ex: - I love listening to music - I like walking in the park PART 2: EXERCISES A PHONETICS I Find the word which has different sound in the underlined part A bird B girl C first D sister A burn B sun C hurt D turn A nurse B picture C surf D return A neighbor B favorite C culture D tourist A hobby B hour C hotel D hot II Put the word into the correct column according the underlined part camera bird learn first final culture natural heard sir girl signal birthday again word world yesterday neighbor turn third assistant /ɜː/ /ə/ B VOCABULARY AND GRAMMAR I Find which word does not belong to each group A reporter B collector C gardener D newspaper A stamp B album C collector D mountain A skating B climbing C gardening D horse-riding A hate B enjoy C love D like A unusual B favourite C popular D common II Read the dialogue and fill the correct words in the blanks, use the words in the box are from enjoy climb show collecting expensive about Nick: Hi Mi, welcome to our house! Elena: Come upstairs! I’ll (1) Mi: Wow! You have so many dolls Elena: Yes My hobby is (2) Mi: I like collecting glass bottles you my room dolls Do you have a hobby? Elena: Really? That’s very unusual Is it (3) ? Mi: Not at all, I just keep the bottles after we use them What (4) collecting? Is it expensive? Elena: I guess so, but all of my dolls (5) uncle always give me dolls on special occasions Mi: Your dolls are all very different Elena: Yes, they’re (6) Nick: I don’t know why girls collect things It’s a piece of cake Mi: Do you have a difficult hobby, Nick? Nick: Yes, I (7) Mi: But Nick, there are no mountains around here! Nick: I know I’m in a mountain climbing club We travel to mountains around Viet Nam In the future, I’ll (8) mountains in other countries too doll presents My aunt and all over the world! mountain climbing III.Complete the sentences with the correct prepositions Mr Porter is nice everyone Kathy was absent class yesterday Are you ready the test? I’m angry Greg I’m mad Peter Are you afraid dogs? Sometimes people aren’t kind One inch is equal I’m thirsty animals 2.54 centimeters a big glass of ice water 10 Joe has good manners He’s always polite 11 I'm not familiar everyone that book Whose is it? 12 John’s thermos bottle is full coffee IV Choose the correct answer in each sentence Are you interested for/ in photography This is my best/ favourite book It’s David Copperfield, by Dickens I’ve decided to make/ join the local swimming club Kate usually passes/ spends most of her time reading Tim has a very interesting fun/ hobby He builds small boats What you like doing in your empty/ spare time? Wendy is a member/ team of the drama club Anna likes going to the cinema/ cinema V Complete the sentences with the correct form of the verbs in brackets Sally and her family love (go) to the park in the summer Her mum likes (lie) favourite magazines on the blanket and loves (read) Anna’s family (like) the park because they love (be) I enjoy (collect) dolls and it becomes my pleasure her outdoors We love (watch) new films, and we (go) watch a new Hollywood film next weekend My brother hates (do) to the same things day after day Our uncle (play) badminton once a week I (collect) a lot of stamps from foreign countries so far In 2100, people (travel) in flying cars 10 I’m so hungry, Mum - I (make) you some sandwiches C READING I Read the text and choose the correct answer If you enjoy cycling for pleasure, doing it in London can be a shock There are not enough lanes especially for bikes, and making your way through the traffic can be very risky But if you have great passion, cycling in London can be exciting, and it is an inexpensive way of keeping fit if you live there Some cyclists don’t mind spending a lot of money on expensive bikes However, if you just want a basic bike that is only for occasional use, there are many cheap choices Several markets have cheap bikes on sale which may not be impressive to look at but should be satisfactory You should buy a cycling helmet if you want to cycle in London Wearing a cycling helmet is not compulsory in Britain, but it is a good idea to wear one for protection What is the main idea of the passage? A Cycling helmets B Cheap bicycles C Bicycle markets D Cycling in London According to the passage, cycling in London is A easy B difficult C tiring D boring C excitement D doing exercise The word “it” in line refers to A cycling B passion The difficulty of cycling in London is described in lines A B C 5-6 D 8-9 According to the passage, all the followings are true EXCEPT that A It is compulsory to wear a helmet when cycling in Britain B Some bikes in London are cheap C There are not many lanes especially for bikes D Some cyclists don’t want to buy expensive bikes II Complete the text with the correct form of the verbs in the list like (2) live be travel sing read go write make This is my favourite singer He (1) a famous rock star He (2) in America He (3) all around the world and (4) in rock concerts He (5) his songs and(6) his own video dips In his free time, he (7) staying at home listening to his CDs At weekends, he usually (8) to expensive restaurants with his friends He also (9) a lot of books about strange things I can’t wait to see him perform live I (10) so much him III.Choose the most suitable word for each space What you like doing best (1) your spare time? My cousin Paul likes going (2) in the country and (3) photos Sometimes he (4) with his friends, and they (5) at the park or at the beach They always (6) a good time His brother Chris isn’t (7) on walking He spends most of the (8) at home A for B when C in D at A for walks B walks C a walk D to walk A making B having C taking D doing A travels B gets up C sees D goes out A enjoy B have fun C hobby D go A have B make C D like A interested B out C decided D keen A other B time C people D money D WRITING I Use the words and phrases to write a passage Stamp collection/ be/ interesting hobby You/ can learn many things, such/ the geography/ a country/ stamps Postal stamps/ be a source/ interesting facts/ important dates/ every country/ the world It/ make stamp collecting/ become very popular As you look at the pages/ a stamp album, you/ can learn interesting details/ foreign customs/ arts/ literature/ history/ culture Their colors/ can make/ you feel relaxed/ happy Collecting stamps/ can become/ a business If you are lucky/ finding/ special stamp, it/ will bring/ you some money besides knowledge/ pleasure II Rewrite the sentences, using the given words What is the price of this watch?  How much ? What is the price of these beautiful scarves? How much ? Can you tell me the way to Dong Nai Post office? Can you tell me ? Can you tell me the way to the station? Can you tell me ? They are fast typists They Peter is a hard worker Peter There are no bottles on the shelf There aren’t We have no time to prepare the speech We don’t have III.Choose the sentence that has the same meaning as the first If you are not careful, you will cut yourself with that knife A Unless you are careful, you will cut yourself with that knife B If you are careful, you will cut yourself with that knife C Unless you are not careful, you will cut yourself with that knife D Unless you were careful, you will cut yourself with that knife Because he doesn’t leave immediately, I call a policeman A Unless he leaves immediately, I won’t call a policeman B If he leaves immediately, I won’t call a policeman C Unless he leaves immediately, I will call a policeman D If he left immediately, I wouldn’t call a policeman Today isn’t Sunday, so the pupils can’t go swimming A If today is Sunday, the pupils could go swimming B If today were Sunday, the pupils could go swimming C The pupils could go swimming unless today is Sunday D The pupils could not go swimming if today isn’t Sunday Stop talking or you won’t understand the lesson A If you don’t stop talking, you won’t understand the lesson B If you don’t stop talking, you wouldn’t understand the lesson C If you hadn’t stopped talking, you wouldn’t understand the lesson D If you hadn’t stopped talking, you wouldn’t have understood the lesson If the homework is difficult, I will ask you for help A Unless the homework is easy, I won’t ask you for help B Unless the homework is difficult, I will ask you for help C Unless the homework is easy, I will ask you for help D Unless the homework isn’t difficult, I won’t ask you for help I’ll let you borrow the book but you must promise to return it next week A If you promise to return the book, I let you borrow it B If you promised to return the book, I’ll let you borrow it C If you promise to return the book next week, I’ll let you borrow it D If you promise to return the book next week, I won’t let you borrow it PART 3: test yourself I Find the word which has a different sound in the underlined part A prefer B better C teacher D worker A bear B hear C dear D near A collect B concern C concert D combine A absent B government C dependent D enjoy A future B return C picture D culture II Complete by changing the form of the word in capitals Running after that thief was very COURAGE You looked so of you! when you fell asleep on the sofa All four of my grandparents are still Did you vote in the last PEACE LIVE ? It can be very difficult for ELECT when they leave prison and go back into the community PRISON At the end of the film, you hear a single and then A1 Pacino falls to the ground SHOOT It’s BELIEVE ! I’ve lost my glasses again! I think were all in that something must be done about the problem AGREE Should I write “British” or “English” as my 10 We’ll only have real ? NATION when women earn as much money as men EQUAL III.Choose the correct answers A, B, C or D Nowadays people A spend hours sitting in front of computers B last C set D take I think you should take up swimmingit is suitable for your health condition A so B because C although D but /id/ /t/ /d/ walked, looked, stopped, volunteered, amazed, acted,wanted, convinced, laughed, bored,terrified,appeared disappointed, fascinated, washed, shocked started, interested II A C C D A B C D D B III B VOCABULARY AND GRAMMAR I C C D B D A A C B 10 D 11 A 12 B 13 B 14 A 15 C II horrified embarrassing interested exciting terrifying – shocked amazed disgusting embarrassed impression funny unsuccessful exciting terrorists unsatisfied western disappointment acting disappointed interested exciting embarrassing embarrassed amazed astonishing amused bored boring III 10 threaten IV 10 boring - interesting V Although I had never seen her before although it was quite cold although we don’t like them very much Although I didn’t speak the language Although the heating was on although I’d met her twice before although we’ve known each other a long time C READING I consisted been explain their way would which fewer recent 10 many C A C B D B C A B 10 D II D WRITING I In spite of being a poor student, Tom studied very well Because of being sick, Mary couldn’t go to school Despite the bad weather, she went to school on time In spite ofmy sickness, my mother told me to go to school Because of a big storm, I stayed at home Despite Tom’s bad grades, he was admitted to the university Despite her physical handicap, she has become a successful woman Although Tom got a good salary, he gave up his job In spite of having not finished the paper, he went to sleep 10 Even though the prices are high, my daughter insists on going to the movies PART 3: TEST YOURSELF I C B B C B B B B C A A A C C D C D B B 10 B 11 A 12 D 13 D 14 B 15 B romantic romance II III IV a In spite of b though a because b although a because of b in spite of a although b because of V terrify violence amazing criticism science frightening impressive 10.actor but actor favourite fantastic become because such main to 10 watching VI VII to see which performed safety acting the production called in because 10 VIII surprising bored confusing disgusting interested annoyed boring exhausted excited 10 amusing IX I couldn’t sleep despite being very tired In spite of having very little money, they are happy Although my foot was injured, I managed to walk to the nearest village I enjoyed the film in spite of the silly story Despite living in the same street we hardly ever see each other Even though I was only out for five minutes, I got very wet in the rain UNIT PART 2: EXERCISES A PHONETICS I 1.D D A C D A D C B VOCABULARY AND GRAMMAR I A B B C D II cultural colourful celebrations traditional celebrated entertainment excitement beginning III D D A B B 6.C B C D 10 D 11 C 12 A 13 C 14 B 15 C 16 B 17 B 18 A 19 B 20 B C READING I It is especially known as Tet Nguyen Dan, or Tet Yes, it is It begins between January twenty- first and February nineteen They tidy their houses, cook special food, clean and make offerings on the family altars Yes, they No, it doesn’t Tet lasts ten days Because Vietnamese people believe that how people act during those days will influence the whole year II important declaration parades celebrate when have Both holidays III C A D A A 6.B C C B 10 D C B A A D B D B D WRITING I II When did Sarah leave? What is she watching? Which film does she like watching? How did you feel before your last Maths test? How did she feel when she watched a gripping film? How far is it from here to ACB bank? How long have you known Marie? Did they use to be friends at the university? III Can you let me know how much the holiday will cost? Could you tell me if there are any cafes’ near here? Do you know if John likes classical music? I wonder if you could tell me where the post office is Could you tell us why you did that? PART 3: TEST YOURSELF I II C B A D C D A C B 10 D expensive easy unhappy/ sad bad quiet near careless young different 10 interviewee III C C A C B B C B went festivals by in such favourite beautiful and D 10 D IV V They give baskets and cups which are filled with sweets and tied with ribbons for their lovers It is called “Black Day” Young Koreans who not have a boyfriend or girlfriend sit with their friends, who are in the same situation, and eat jajang noodles It is popular to send an “anti-valentine” card to person they hate (with an insulting message), to their current partner (with a goodbye message) or to end their relationship (with C - Ya message) VI C A B A D 1.d g j a h c i e b 10 f 1.D C A A D D B B A 10 C How Have What Who did Was Were what Did VII VIII IX UNIT 10 PART 2: EXERCISES A PHONETICS I Stress on 1st syllable Stress on 2nd syllable calendar, exercise, travelling, similar, marvelous, convenience, familiar, important, excellent, wonderful, biogas, scientist, energy, abundant, convenient, musician, dangerous, excellent, plentiful polluting II C D D A C C B D B A C D A III B VOCABULARY AND GRAMMAR I B A D D C 6.B B C D 10 C 11 D 12 D 13 A 14 C 15 A II Public transport will be used to go to school by students A great deal of electricity will be generated by solar power this summer Will the solar panels be installed on the roof of the house tomorrow? Plants won’t be burnt to heat this winter by local people The air will be polluted by the smoke from factories A hydro power station will be built in this area III will be studying Will you be waiting will be having will be wearing will send will arrive will be lying will be working will be meeting 10 will be playing 1.economically renewable alternative electricity power environmentally transportation/ transport heat produce 10 shortage IV C READING I B D A C B A D 8.B C 10 A II important run give to comes natural burning kinds use 10 find D D D A D III D WRITING I Solar panels will be installed on the roof of our house next week A new school will be built for poor children next month Will cracks on the water popes be checked in two days (by the plumber)? These chemicals are sold everywhere in my hometown The film on types of future energy sources won’t be shown next Friday The new president will be interviewed on TV The old thermal power plant will be destroyed at the end of this year The road to our village will be widened next year Biogas will be used for cooking and heating at this time next month 10 The first prize was gotten at the competition II Many countries are already using solar energy Saving energy is one of the best ways to conserve natural resource At present, most of our electricity comes from the use of coal, gas, oil or nuclear power Plant trees because trees create shade around your house and help keep it cool This power could be provided by the sun Don’t leave the fridge door open because cold air escapes and this uses a lot of electricity One percent of the solar energy that reaches the earth is enough to provide power for the total population Turn off all the lights every time you leave the room PART 3: TEST YOURSELF I C D C A B B B B 1.C B C A A A B C C B B B A D 10 D 11 B 12 C 13 A 14 B 15 D II III IV cheaper effective solar pollution unlimited Unfortunately Electrical installation deep 10 Energetic V resources fuels sources renewed alternative B C A C B D A C B 10 D D D C B VI VII C VIII using → used rebuild → rebuilt be → Bỏ taken stay → staying → taking IX More regulations will be made to reduce industrial pollution by governments Fossil fuels won’t be burnt for energy in the future More wind turbines will be constructed in that area to produce electricity Will our electricity bills be reduced to 20% in five months? Alternative sources of energy will be developed Electricity will be being provided at this time next year Solutions will be found to reduce pollution in our city by scientists The tax on petrol will be increased to 15% next September With that device the wave energy will be changed into electricity 10 Ordinary 100- watt light bulls will be replaced with energy-saving ones X Solar panels are placed on the roof of a house and the sun’s energy is used to heat water There are many things you can at home to help your family more energy efficient The energy can be stored for a number of days Shut down the computer, TV and other electrical stuff when you aren’t using it Viet Nam has an advanced technology of solar energy Cars will use solar energy instead of gas by the year 2030 On cloudy days you can use solar energy, too Talking a short shower instead of a long bath can help save energy UNIT 11 PART 2: EXERCISES A PHONETICS I B C B A C A B B VOCABULARY AND GRAMMAR I D B A II Noun death waste belief advertisement promise feeling advice description invention government Verb Noun death honesty variety madness mystery beauty wealth success comfort peace die waste believe advertise promise feel advise describe invent govern Adjective dead honest various mad mysterious beautiful wealthy successful comfortable peaceful III are having will remember Are you going will pass will complain will am seeing are you going to Will you tell 10 is going to grow IV her – mine 2.Their – Ours your – his 4.his – mine V B D A C A 1.for to of of with after off off on 10 on VI C READING I already will from carry journey passengers make successful Her - Yours II B A D C A D D WRITING I Renewable energy will be used in the future This school is ours How far is it from Vinh to Hanoi city? I used to walk to school when I was a student In spite of being short, they still love playing sports Solar energy will be used to protect the environment In spite of eating lots of food, she is still very slim How far is it from Hanoi to HCM city? I am interested in English 10 They will fix our roof tomorrow II There are a lot of tables in the café There is much information in the theatre programmes There are more than thirty theatres in London There is a swimming pool in the garden There are both private and state schools in the system It took me months to accomplish this task Sorting out her stamps took Jane hours a week The pictures will take minutes to reach the earth It took her 30 minutes to write the letter 10 It took him hours to finish his essay PART 3: TEST YOURSELF I A B D C B D B B C B e c 3.b d f mine his theirs your his her ours my II III IV V products innovations inventor electricity 5.friendly shortage a protection knowledge heated 10 appliances VI C C D D B 6.C A 8.B C 10 A 11 D 12 A 13 B 14 C 15.A 16 C 17 D 18 B 19 D 20 A VII your – yours – Yours – hers – My – Hers his – yours – Mine your – his your – yours – yours – Mine VIII in/ in of/ of with into/ at to/ in of for of for 10 at plane called takes fly won’t will than from expensive 10 ready IX X a → an a → the such → so are → is many → a lot of more → bỏ “more” does → is → was getting → to get 10 starts → started UNIT 12 PART 2: EXERCISES A PHONETICS I Stress on the 1st syllable Easter, natural,crowded, megacity,water, criminal, energy,slavery, festival II Stress on the 2nd syllable perform, behind,disaster, imagine, affect,pollution, enormous,enjoy, explosion Stress on the 3rd syllable population,overcrowded A A D A B B VOCABULARY AND GRAMMAR I C B C A D D B D A 10 A 11 A 12 C 13 C 14 A 15 D II temperature shortages homeless 4.earnings accommodation affected peaceful growth population isn’t she? isn’t it? isn’t he? they? isit? will they? aren’t I? isn’t he? mustn’t we? 10 medical III 10 didn’t it IV 1.less more less more some less 7.less some 9.less 10 fewer all grows build polluting unhealthy vehicles spending traffic problems 10 better exceeds caused better becomes fewer crime provide between prices 10 more C READING I II III The toilets are in the streets Mumbai is located on the western coast of India Yes, it is Because it is home to Bollywood, the centre of Hindu movie industry There are 12 different neighbourhoods in Dharavi They can crack and take in sewage D WRITING I Shanghai has more skyscrapers than Jakarta You didn’t remember to turn off the T.V last night, did you? The countryside suffers less pollution than the city Why don’t you go to work by bike? Tokyo has fewer billionaires than New York More trees will be planted along this street Overpopulation causes a lot of social problems in this area, doesn’t it? Pollution is the most serious problem, isn’t it? Did a group of foreigners visit the slums last week? 10 Mr Lam used to live in the country when he was a child PART 3: TEST YOURSELF I A C C A D C A B D B A B C B C B A A C 10 C II III IV will they hasn’t he didn’t you can they doesn’t he doesn’t she will he weren’t there may not it 10 should we V their noisy peaceful crowds live because built work area 10 more VI population poverty development increasing administrations conditions megacities order contributes 10 although VII It is 66,140 people per square kilometers They lack clean drinking water, work, and access to healthcare and education It was fifty million people/ inhabitants They live in home-made shacks built in cemeteries, or between railroad tracks or under bridges / They live wherever they can find some space There are 12 million (inhabitants) VIII did he? aren’t there? did she? are they? is it? could she? doesn’t she? hasn’t it? didn’t she? 10 did they? IX much bigger much more complicated than a bit cooler far more interesting than a bit more slowly a lot easier slightly older X older older or elder older THE SECOND TERM TEST I C B 3.A 4.D C A C B D D A B D B A B C B 10 C 11 C 12 A 13 D 14 D 15 D 16 A 17 C 18 B 19 A 20 B at in at in at at on in II III IV V We can enjoy Pho during the day The chicken meat served with ga is boneless and cut into thin slices The rice noodles are made from the best variety of rice The broth for bo (beef noodle soup) is made by stewing the bones of cows for a long time in a large pot VI 1.T F T F VII They will be learning English at this time tomorrow We will reduce the use of electricity to save our energy I think biogas is abundant and cheap for cooking and heating Will we use public transportation when travelling long distances? VIII Sources of energy will be used more effectively for our future The problem of energy shortage will be solved by using solar energy Coal will be replaced by another renewable source Flying cars will be used to travel from place to another place IX Have you ever been to London? Peter doesn’t usually get up before seven Our friends must often write tests They sometimes go swimming in the lake The weather is always bad in November Peggy and Frank are usually late I have never met him before John seldom watches TV I was often in contact with my sister 10 She will always love him X can’t they did they did it doesn’t he wouldn’t he are they aren’t I is if have you 10 isn’t it CONTENTS ... B VOCABULARY AND GRAMMAR C READING D WRITING PART 3: TEST YOURSELF SáchBài tập Tiếng Anh lớp 7 ược biên soạn dựa thực tiễn việc dạy học tiếng Anh Đây nguồn tài liệu tham khảo bổ ích cho giáo viên... THỊ HỒNG ĐIỆP BÀI TẬP TIẾNG ANH LỚP CÓ ĐÁP ÁN (Theo chương trình Tiếng Anh Bộ giáo dục Đào tạo) NHÀ XUẤT BẢN ĐẠI HỌC QUỐC GIA HÀ NỘI Lời nói đầu Sách Bài tập Tiếng Anh lớp dựa vào phương pháp... kiểm tra (Tests), giúp cho người học có khả tổng hợp kiến thức hiệu Mỗi học sách Bài tập Tiếng Anh lớp 7 ược biên soạn theo chủ điểm quen thuộc với học sinh Trung học sở Mỗi đơn vị học chia thành