Tìm từ thích hợp điền vào chỗ trống

mọi người giúp em với ạ . Em cảm ơn

Giúp em với ạ, em xin cảm ơn trước

Tìm x,y,z biết : 2/x = 3/y = 4/z và x - y - 2z = -18

hepllllllllllllllllllllllllllll

So sánh 7^20 và 51^10 399^2 và 398×400

Ai biết câu nào thì giúp minh với

TAG QUESTIONS I. Choose the word or phrase A, B, C or D that best completes the sentence: 1. No one is better cook than his mother, ______? A. is she B. isn’t she C. are they D. aren’t they 2. Do it right now, ______? A. will you B. shall you C. do you D. don’t you 3. There are no easy ways to learn a foreign language, _______? A. are they B. are there C. aren’t they D. aren’t there 4. He seldom goes to the library, ______? A. doesn’t he B. is he C. does he D. isn’t he 5. Let’s go for a long walk, ______? A. will we B. shall we C .don’t you D. do you 6. I think he will join us, _____? A. doesn’t he B. won’t he C. will he D. don’t I 7. The film is good, _______________? A. is it B. are they C. isn’t it D. aren’t they 8. You are going to the party, ____________? A. is you B. are you C. aren’t you D. were you 9. He can speak English, _________________ ? A. can he B. can’t he C. can’t him D. could he 10. You don’t know him,__________________ ? A. do you B. don’t you C. are you D. aren’t you 11. Lan speaks Chinese very well, __________? A. does she B. doesn’t she C. is she D. was she 12. John has worked hard, _________________? A. does he B. did he C. has he D. hasn’t he 13. They invited him to the party, ___________? A. do they B. don’t they C. did they D. didn’t they 14. They are leaving here tomorrow________? A. do they B. are they C. aren’t they D. did they 15. I’m a bit late, ______? A. am not I B. aren’t you C. are you D. aren’t I 16. No one is indifferent to praise, ______? A. is one B. isn’t one C. is he D. are they 17. Somebody has left these socks on the bathroom floor, ______? A. have they B. haven’t they C. has he D. hasn’t he 18. He has a ticket to the game, _____? A. does he B. has he C. doesn’t he D. hasn’t he 19. You aren’t too busy to talk, ______? A. are you B. have you C. aren’t D. do you 20. The ticket to London doesn’t cost a lot, ______? A. do they B. does it C. is it D. isn’t it 21. You don’t need me any more, ______? A. do I B. don’t I C. do you D. don’t you 22. Nobody knows who invented the wheel, ______? A. do they B. don’t they C. does it D. doesn’t it 23. Harry was working in Bristol then, ______? A. was Harry B. wasn’t he C. was he D. didn’t he 24. You’ll be home before midnight, ______? A. will you B . won’t you C. are you D. won’t you be 25. David is bringing some wine, ______? A. is he B. isn’t he C. is David D. isn’t David 26. Don’t leave anything behind, ______? A. do you B. don’t you C. will you D. shall we 27. That isn’t Bill driving, ______? A. is it B. is that C. isn’t that D. isn’t it 28. Nobody likes the play, __________? A. do they B. don’t they C. didn’t they D. did they 29. The children can read English, __________? A. can’t they B. can they C. they can D. they can’t 30. Your grandfather was a millionaire, ______? A. was he B. is he C. wasn’t he D. isn’t he 31. Your brother’s here, ______? A. is he B. are he C. isn’t he D. aren’t he 32. That was Ann on the phone, ______? A. was it B. was that C. wasn’t that D. wasn’t it 33. Tom didn't see her, ______? A. did Tom B. did he C. do Tom D. does he 34. Mary wasn't angry, ______? A. was she B. is she C. wasn’t she D. was Mary 35. Susan doesn't like oysters, ______? A. did she B. does she C. doesn’t she D. she does 36. We should call Rita, _______? a. should we b. shouldn't we c. shall we d. should not we 37. These books aren't yours, ____? a. are these b. aren't these c. are they d. aren’t they 38. You've never been in Italy, _____? a. haven’t you b. have you c. been you d. had you 39. No one died in the accident, _____? (British English) a. didn’t they b. did he c. didn't he d. did they? 40. I'm right, _____? a. aren't I b. amn't I c. isn't I d. not I am 41. They never came to class late, and _________. a. neither did we b. so did we c. we did either d. neither we did 42. Tom knows Alice Reed, _____? a. doesn't he b. does he c. is he d. isn’t he 43. They are studying pronunciation with Mr. Brown, _____? a. are they b. aren’t they c. do they d. don’t they 44. She should have obeyed her parents, _____ she? a. should b. should have c. shouldn't have d. shouldn't 45. My father doesn’t speak Chinese, and_____ a. my mother does neither b. my mother doesn't too c. neither does my mother d. so doesn’t my mother 46 Sally turned in her report, _____? a. had she b. did she c. hadn't see d. didn’t she 47. This is the second time she has been here, _____? a. has she b. hasn't she c. isn’t this d. isn't it 48. They must do as they are told, _____ a. so must I b. I must either c. I do too d. I am too 49. 'I don’t like strong coffee' 'No, _____." a. I don't too b. either don't I c. me either d. neither don't I 50. He hardly has anything nowadays, _____? a. has he b. doesn’t he c. does she d. hasn't she

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