20. ----You didn’t come to the party yesterday.

---- ______? I’m not a party animal.

A. How can I have　 　B. How would I have　 　　C. Why should I have 　　D. Why must I have

19.----Will you be ____ this afternoon , John?

----It depends. I’ m afraid I’ll be called in by my boss.

A. suitable　　 　　 　　B. available 　　　　　C. accurate　 　　 D. convenient

18. ----Jack, can you make a sentence to ________ the meaning of the new phrase?

　 ----Well…

A. show off　　 　 　　　　　B. turn out　　　　　　 　 C. bring out　　 　　　　 D. take in

17. _____ he met with the difficulty did he realize the importance of group work.

A. Even though　 　　 B. Not until　 　　 C. Only before　 　　　D. Ever since

16. More important, perhaps, education teaches us to see the connections between things, as well as ______ beyond our immediate needs.

A. to be seen　　 　　　　 B. to see 　　　　 C. seeing　　　 　　　 D. having seen