Cho tam giác ABC vuông ở A, cạnh BC cố định. Gọi I là giao điểm của ba đường phân giác trong. Khi A thay đổi thì điểm I di chuyển trên đường nào ?

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CÂU HỎI ĐUÔI – TAG QUESTIONS Choose the best option to complete these following sentences. 1. We should call Rita, _________? A. should we B. shouldn't we C. shall we D. should not we 2. Monkeys can't sing, _________? A. can they B. can’t they C. can it D. can't it 3. These books aren't yours, ________? A. are these B. aren't these C. are they D. aren’t they 4. That's Bud’s, _______? A. is that B. isn’t that C. is it D. isn’t it 5. No one died in the accident, _________? (British English) A. didn’t they B. did he C. didn't he D. did they? 6. I'm right, _____? A. aren't I B. amn't I C. isn't I D. not I am 7. They never came to class late, __________? A. didn’t they B. did they C. do they D. don’t they 8. My wife had never been to Hue, __________? A. did she B. didn’t she C. had she D. hadn’t she 9. They are studying pronunciation with Mr. Brown, _______? A. are they B. aren’t they C. do they D. don’t they 10. She should have obeyed her parents, ________? A. should she B. should have she C. shouldn't have she D. shouldn't she 11. My father doesn’t speak Chinese, ________? A. doesn’t he B. does he C. don’t he D. doesn’t my father 12. The air-hostess knows the time she has been here, ________? A. does she B. isn’t it C. doesn’t she D. did she 13. This is the second time she has been here, ________? A. has she B. hasn't she C. isn’t this D. isn't it 14. They must do as they are told, _______? A. must I B. mustn’t they C. must he D. must we 15. 'I don’t like strong coffee, _______? A. don't I B. do I C. does I D. doesn’t I 16. He hardly has anything nowadays, _______? A. has he B. doesn’t he C. does she D. hasn't she 17. You've never been in Italy, _______? A. haven’t you B. have you C. been you D. had you 18. There’s little water left, _______? A. isn’t there B. is there C. are there D. aren’t there 19. Everybody is happy, ________? A. isn’t it B. is it C. are they D. aren’t they 20. Let’s go out tonight, ________? A. will we B. won’t we C. won’t they D. shall we