Tìm các số hữu tỉ a để P = $\frac{√a + 7}{√a + 2}$ có giá trị nguyên

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4. Oil________ if you pour it on water a. floated b. floats c. will be floated d. float 5. When he returned home, he found the door________. a. unlocking b. unlocked c. to be unlocked d. have unlocked 6. That dancing club________ north of the city a. lays b. lies c. locates d. lain 7. Almost everyone________ for home by the time we arrived. a. leave b. left c. leaves d. had left 8. By the age of 25, he ________ two famous novels. a. wrote b. writes c. has written d. had written 9. While her husband was in the army, Janet________ to him twice a week. a. was writing b. wrote c. was written d. had written 10. I couldn't cut the grass because the machine_______ a few days previously. a. broken down b. has been broken c. had broken down d. breaks down 11. We ________English this time last week. a. learned b. were learning c. have learned d. had learned 12. Is it raining? - No, it isn't but the ground is wet. It________ a. rained b. had rained c. has rained d. has been raining 13. Her family________ to America before 1975. a. went b. have gone c. had gone d. would go 14. When I arrived at the party, Martha________ home already. a. went b. have gone c. had gone d. would go 15. Henry________ for 10 years when he finally gave it up. a. has smoked b. has been smoking c. had smoked d. had been smoking' 16. Yesterday morning I got up and looked out of the window. The sun was shinning but the ground was very wet. It________ a. rained b. has been raining c. had rained d. had been raining 17. We ________ our examination next month. a. have b. shall have c. will have had d. will be having 18. Look that those black clouds! It________ a. is going to rain b. will rain c. would rain d. can rain 19. We________ English this time next Monday. a. learn b. will learn c. are learning d. will be learning 20. We________ this course before the final examination. a. are going to finishb. have finished c. will finish d. will have finished

Rewrite each of the following sentences so that the original meaning stays the same. 1. The treasure is thought to date from the 13th century. (THAT) It …………………………………………………………………………… 2. They say the star’s wife is unreliable. (SAID) It ……………………………………………………………………………. 3. She isn’t here. (WISH) I ……………………………………………………………………………. 4. He was in the habit of smoking. He no longer smokes. (USED) He ……………………………………………………………………………. 5. My father used to play football when she was young. (MORE) My father doesn’t …………………………………………………………….. 6. Let’s go swimming. (SUGGESTS) She …………………………………………………………………………….. 7. I was glad that I received a gift from an old friend. (TO) I was ……………………………………………………………………… 8. I wish I could speak French. (ONLY) If …………………………………………………………………… 9. She sold her house and moved to Brighton. (HAD) Before she …………………………………………………………………. 10. He was very kind to me. He shared his lunch with me. (OF) It was very kind …………………………………………………………………..

HELP!!!!!!! 20 Đ Make questions for the underlined parts, using the question words in brackets. 1. In 201, 51,515 people attended Burning Man. (How many) .......................................................................................................................... 2. Some youngsters accidentally knocked over one of the giants. (What) .......................................................................................................................... 3. The highlight of the festival is the tomato fight. (What) ......................................................................................................................... 4. La Tomatina dates back to 1945 when an annual parade of enormous figures with big heads was passing through the streets of Bunyol. (When) .......................................................................................................................... 5. La Tomatina in Bunol near Valencia happens every year. (How often) .......................................................................................................................... 6. La Tomatina takes place on the last Wednesday in August. (When) .......................................................................................................................... 7. The festival began in San Francisco’s Baker Beach in 1986. (When; Where) .......................................................................................................................... 8. It takes its name from the ritual burning of a large wooden model of a hated person. (What) .......................................................................................................................... 9. Burning Man lasts one week. (How long) .......................................................................................................................... 10. The event begins on the last Monday in August, and ends on the first Monday in September. (When) ..........................................................................................................................