391. Besides rain, ………………. is seldom pure. a. water naturally b. natural water c. water of nature d. the nature's water → b 392.The FDA was set up in 1940 ………………. that maintain standards for the sale of food and drugs. a. to enforce the laws b. to enforcing laws c. enforcing laws d. enforced the laws → a 393. …………… shops are closed on Saturday afternoon. a. Most the b. Most c. Most of d. Most our → b 394. There are …………… organizations to help the deaf and the blind. a. much b. a little c. many d. little → c 395. ……………. electricity depends on a knowledge of atoms and the subatomic particles of which they are composed. a. The understanding b. To understand c. Understanding d. For understanding → c 396. If England had not imposed a tax on tea two hundred and twenty years ago, …………… the United States have remained part of the British commonwealth? a. will b. would c. have d. had → b 397. Scientific fish farming, known as aquaculture, has existed for more than 4000 years, but scientists who …………… research in this field are only recently providing the kind of information that growers need to increase production. a. make b. makes c. does d. do → d 398. I paid …………… money for a new house. a. many b. a number of c. a large number of d. a lot of → d 399. A good summary should be …………… and …………… a. short / clear b. long / full of detail c. long / exciting d. short / lengthy → a 400. Frank Lloyd Wright has been acclaimed by colleagues as ………… of all modern architects. a. the greater b. the greatest c. the more great d. the most great → b II. FIND THE MISTAKES (400 SENTENCES ) 1. The main office of the factory can be found in Maple Street in New York City. a. The main b. be found c. in d. in → c 2. Because there are less members present tonight than there were last night, we must wait until the next meeting to vote. a. less b. than c. were d. to vote → a 3. David is particularly fond of cooking, and he often cooks really delicious meals. a. particularly b. fond of c. often cooks d. really → d 4. The progress made in space travel for the early 1960s is remarkable. a. progress a. made c. in space d. for → d 5. Sandra has not rarely missed a play or concert since she was seventeen years old. a. not rarely b. a play c. since d. was seventeen years old → a 6. The governor has not decided how to deal with the new problems already. a. The b. has c. how to deal with d. already → d 7. There was a very interesting news on the radio this morning about the earthquake in Italy. a. There was b. a c. on the d. about → b 8. The professor had already give the homework assignment when he had remembered that Monday was a holiday.