21. My dictionary has disappeared. Who ______ have taken it?

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

20. ______ the size and nature of a business is, its main goal is to earn a profit.

A. Whatever 　　　　　 B. Whichever　 　　　 C. Whereas 　　　　　　 D Because

19. This is your last chance. You may as well ________ full advantage of it .

A. make　 　　　　　　　　 B. get　 　　　　　　　　　 C. take　 　　　　　　　　 D. have

18. The room is so dirty. ______ we clean it?

A. Will　 　　　　　　　　　 B. Shall　 　　　　　　　 C. Would　 　　　　　　 D. Do

17. Looking at my determined face, the big boy ______ pick up the fight.

　 A. dares not　　　　　　　 B. dare not　　　　　　　 C. doesn't dare　　　　 D. dares not to

16. You can’t imagine that a well-behaved gentleman ______ be so rude to a lady.

　 A. might　　　　 　　 B. need　　　　　 　　　　　　　　　　　　　　　 C. should D. would

15. --- Is John coming by train?

　 --- He should, but he _____ not. He likes driving his car.

A. must　 　　　　　　　　 B. can　 　　　　　　　　　 C. need 　　　　　　　　　 D. may

14. - I wonder if I ____ smoke here.

　 - No, you _______. Could you see the sign “No Smoking” there?

A. can, needn’t 　　　 B. shall, won’t 　　　　 C. must, can’t 　　　　 D. may, mustn’t

13. - You know that you were driving 100 km an hour, don't you?

- No officer, I _______. This car doesn't do more than 80.

A. may not have been 　　　　　　　　　　　　　　 B. couldn’t have been

C. mustn’t have been 　　　　　　　　　　　　　　 D. shouldn’t have been

12. --- They have not finished the work up to now.　　　　 --- Well, they ______

A. should have　 　　 B. should　　 　　　　　 C. ought to　　 　　　 D. ought have