20．---I’m terribly sorry to have put you through so much trouble.

--- ________. I know you didn’t mean to.

A. Forget it　　　 B. No trouble　　　 C. All right　　 D. You’re welcome

19．A study shows that students living in non-smoking dormitories are less likely to ________ the habit of smoking.　

　A. pick up　　　　 B. turn up　　　 C. draw up　 D. make up

18．--- ______，he knows a lot of things. 　 A. The child as he is　 B. Child as he is　 C. A child as he is　 D. Child he as is

17．The play had already been on for quite some time when we __ at the New Theatre. 　A. have arrived　　　　　 B. arrived　　　　　　　　　C. had arrived　　　　　　　 D. arrive

16．Once again he didn’t hand in his homework _____ he had been given enough time to do it．

　　　 A．in case　　 B．as though　 C．so that　　 　 D．even though

15．---　 They live on a busy road．　　

---　 There ______ be a lot of noise from the traffic．

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

14．_____ the chapter four times, I finally understood the author's theory．

　　　 A．Reading　　 B．Having read　 　　　 C．To read　 　　 D．Read