21. ---The woman biologist stayed in Africa studying wild animals for 13 years before she returned.

　 ---Oh, dear! She ____ a lot of difficulties!

A. may go through　　　　　　　 B. might go through　　　

C. ought to have gone through　　 D. must have gone through

20. ____ is often the case, we have worked out the production plan.

A. Which　　 　B. When　　 　C. What　　 　D. As

19. There were so many people in the street watching the fire that firefighters could not get ____ the building.

A. close to　　 B. closely to　　 C. close at　　 D. closely at

18. The young man acted strangely during the interview. He made a bad ____ on the employer.

A. impression　　 B. expression　　 C. experience　　 D. opinion

17. The laid off worker can hardly ____ and clothe his family.

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

16. It’s a custom in China to have some tea or other drinks before the meal ____.

A. serves　　 B. served　　 C. is served　　 D. to be served

15. I hadn’t meant ____ you. Instead, what I said really meant ____ you to be good.

A. hurting; advise　　 B. hurting; advising　　 C. to hurt; to advise　　 D. to hurt; advising

14. He owes his success ____ hard work and good luck.

A. for　　 B. on　　 C. to　　 D. at

13. I don’t think we’ll be able to ____ any the house if we don’t save pennies.

A. afford　　 B. spend　　 C. share　　 D. bear

12. Thanks to the satellites, football games come to us ____ on TV.

A. living　　 B. lively　　 C. live　　 D. alive