情態動詞
c. must have fallen d. mustn't have fallen 8. the only thing that really matters to the children is how soon they return to their school. a. can b. must c. have to d. ought to 9. i want to go to the chemist's, but you go with me. a. need not b. must not c. need d. must 10. i thought it over, but come to no conclusion. a. can b. could c. should d. would 11. what we get seems better than what we have. a. can b. could c. can't d. couldn’t 12.─my goodness! i've just missed the train. ─that's too bad. i am sure you it, if you had hurried. a. could have caught b. had caught c. would catch d. could catch 13. look! what you've done! you more careful. a. may be b. had to c. should have been d. would be 14. i repeat the question? a. shall b. will c. do you want that d. do 15. professor li, many students want to see you. they wait here or outside! a. do b. will c. shall d. are 16. you read that book if you don't want to. a. haven't b. can't c. mustn't d. needn't 17. johnny, you play with the knife; you hurt yourself. a. won't; can't b. can't; shouldn't c. shouldn't; must d. mustn't; may 18. it's nearly seven o'clock. jack be here at any moment. a. must b. need c. can d. should 19. ─ there were already 5 people in the car, but they managed to take me as well. ─ it a comfortable journey.