20. --- The book isn’t easy for Li Ming to understand, is it?

　 --- ________ . His foreign language is far better than expected.

A. No, it isn’t　　　　　　　　　　 B. I’m afraid not

C. I don’t think so　　　　　　　　 D. Yes, it is

19. At that time, no one believed that his book would______ .

A. go off　　　　　 　B. take off　　　　　 C. pay off　　　 　D. give off

18. Well, Stephen and Catherine, let’s hold up our Mao-tai wine glasses and drink ____ the founding of the P.R.C. here. Cheers!

A. for　　　　　 　　B. on　　　　　　　 C. with　　 　　　D. to