giải thích nữa nhá 1. You don't look well. You ________ see a doctor. A. could B. need to C. are to D. should 2. She ________ home yesterday because her little son was sick. A. could have stayed B. must have stayed C. had to stay D. should have stayed 3. You ________ disturb him during his work! A. should not B. needn't C. mustn't D. don't have to 4. Whose car is this? – It ________ be Anton's. I think I saw him driving a red car like this one. A. could B. might C. must D. would 5. Though he was ill and weak, he ________ get out of the burning building. A. was able to B. might C. could D. should 6. ________ lending me your CD player for a couple of days? A. Can you B. Would you mind C. Would you D. Could you 7. The windows look clean. You ________ wash them. A. are not to B. needn't C. don't have to D. mustn't 8. I don't believe it. It ________ be true. A. can't B. mustn't C. shouldn't D. wouldn't 9. Young people ________ obey their parents. A. must B. may C. will D. ought to 10. Jenny's engagement ring is enormous! It ________ have cost a fortune. A. must B. might C. will D. should