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Tranlan
2 năm trước
Cho a,b,c là các số hữu tỉ thỏa mãn ab+bc+ac=1 Chứng minh (a^2+1)(b^2+1)(c^2+1) là bình phương của 1 số hữu tỉ
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CẦN GẤP, VOTE NẾU LÀM ĐÚNG I. Choose the best answer for each of the following sentences. 1. If I _____ you, I wouldn’t buy that book. A. are B. am C. were D. aren’t 2. If she _____ harder, she can pass the exam. A. study B. studies C. studied D. studying 3. If you waited, he _____. A. will come B. would come C. comes D. wouldn’t come 4. If you _____ the bell, the servant would come. A. ring B. rings C. don’t ring D. rang 5. If it _____ a lot, the rice crop wouldn’t grow. A. don’t rain B. didn’t rain C. rained D. didn’t rained 6. If I steal her pocket dictionary, she _____ angry. A. will be B. is C. are D. won’t be 7. If you press that button what _____? A. happen B. happened C. will happen D. would happen 8. If I had free time, I _____ some shopping with you. A. would do B. did C. do D. will do 9. If she _____, she will be late for school. A. hurry B. hurries C. doesn’t hurry D. don’t hurry 10. If I were you, I _____ that job. A. will accept B. would accept C. won’t accept D. accepted 11. If the weather is nice, I _____ go for a walk. A. will go B. go C. would go D. would have gone 12. If you tried for best, you _____ the final exam. A. won’t fail B. wouldn’t fail C. failed D. wouldn’t have failed 13. If she had money, she _____ that car. A. would buy B. buys C. will buy D. bought 14. If I had a map, I _____. A. won’t get lost B. will get lost C. wouldn’t get lost D. didn’t get lost 15. If you _____ my secret, I will help you. A. will keep B. keeps C. kept D. keep 16. If she _____ the fish here, the cat will eat it. A. leaves B. left C. doesn’t leave D. leave 17. If you drove more slowly, you _____ so many accidents. A. won’t have B. wouldn’t have C. would have D. will have 18. If it is sunny, I _____ fishing. A. won’t go B. don’t go C. will go D. go 19. If I came early, I _____ him. A. could have met B. could meet C. couldn’t have met D. meets 20. If he _____ to see me yesterday, I would take him to the movies. A. came B. had come C. comes D. will come 21. If I _____ a typewriter, I could type it myself. A. have B. had C. has D. am having 22. If I _____ his telephone number, I would give it to you. A. knows B. know C. knew D. have known 23. If he _____ harder, he can pass an exam. A. has studied B. have studied C. study D. studies 24. Tell him to ring me if you _____ him. A. sees B. saw C. have seen D. see 25. If I became very rich, I _____ the hospital for the poor. A. will build B. would build C. build D. won’t build 26. If today _____ Sunday, we wouldn’t have to work. A. is B. are C. were D. isn’t 27. He _____ an accident if he drove more carefully. A. wouldn’t have B. will have C. wouldn’t have had D. won’t 28. If we _____ hurry up, we will miss the flight. A. did B. don’t C. do D. does 29. You _____ much progress if you attended class regularly. A. can make B. will make C. could make D. make 30. If she _____ more carefully, she might not make too many mistakes. A. has written B. had written C. wrote D. writes 31. If she had your address, she _____ to you. A. would write B. would have written C. wrote D. writes 32. If _____ free time, he’ll play tennis. A. he have B. can he have C. will he have D. he has 33. If you _____ water, it turns to vapor. A. boiled B. boil C. has boiled D. have boiled 34. If you _____ my advice, you would be a millionaire. A. had taken B. took C. takes D. take 35. If we found him earlier, we _____ his life. A. can save B. can saves C. could save D. saved

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