21. -I’ll be waiting for you at home.

-_______ I were busy and couldn’t come?

　 A．What if　　　　 B．What about　　　　 C．How if　　　　　　 D．How come

20. I have ever seen such a strange glasshouse _________you told me about.

　　 A. As　　 B. before　　 C. that　 D. which

19. _______, he had to give up his teaching.

A. With his health failing　　　　　 B. His health was failing

C. As his health failing　　　　　　　　 D. Though his health was failing

18. Why do you want the book so much? _______ the universe, sir.

A. Studying　　　　　 B. To study　　 C. Study　　　　 D.For studying

17. Production fell _______ 20% in May, _______ the same month of last year.

A. in, compared to　　　　　　　　　　 B. by, compared to

C. with, compared with　　　　　　　　 D. by, comparing with

16. How can he find a job without being trained? I wish he _______ a computer.

A. will learn　 B. should operate C. could operate　　 D. is learning

15. He is not __________to be present at the meeting tonight.

　　 A. possible　 B. likely　　 C. probably　　 D. perhaps

14. I felt it a great honour ________ to speak to you.

　 A. ask　　　 B. asking　　　　　 C. to be asked　　　　　 D. having asked

13. Your dress looks very nice. My mother will buy _______ for me.

　 A. it　　　　　　 B. that　　　　 C. the one　　　　　 D. one

12. We must struggle _____ the enemy _______.

A. for; face-to-face　　　　　　　　　　 B. against; face to face

C. against; face-to-face　　　　　　　　 D. for; face to face