22. I was really anxious about you. You _____ home without a word.

　 A. mustn’t leave　　　　　　　　 B. shouldn’t have left　

C. couldn’t have left　　　　　　 D. needn’t leave

21. The boss has given everyone a special holiday, so we _______go to work tomorrow.

　　A. can’t　　　 B. mustn’t　　　 C. needn’t　　　 D. shouldn’t

20. The teacher _______have thought Johnson was worth it or she wouldn’t have wasted time on him, I suppose.

　 A. should　　　 B. can　　　 C. would　　　 D. must　

19. -------My cat’s really fat.

　 -------You ____have given her so much food.

　 A. wouldn’t　　　 B. couldn’t　　 C. shouldn’t　　 D. mustn’t

18. ------What do you think we can do for our aged parents?

　 ------You______ do anything except to be with them and be yourself.

　 A. don’t have to　 B. oughtn’t to　 　C. mustn’t　　 D. can’t

17. ------Didn’t they come to the party last week?

　 -------Yes. They didn’t want to come with us at first, but then we _____persuade them.

　　A. would　　　 B. could　　　 C. were able to　　　 D. had to

16. He ____his parents that he has failed in the exam.

　 A. dares not tell B. didn’t dare tell C. dare not tell D. dares not to tell

15. ------Oh, my goodness! My laptop must have got stolen!

　 -------But where ______a thief have entered the house with all the doors and windows still locked?

　 A. should　　 B. could　　　 C. dare　　　 D. did　

14. You ____have the book when I finish it.

　 A. will　　　 B. would　　　 C. could　　 　D. shall　

13. He has no money, otherwise he ______buy a car.

　 A. must　　 B. would　　　 C. should　　 D. could