21. Good technique in medicine means less pain and fewer deaths and, ___, it is our duty to master it.

　 　A. altogether　 B. therefore　 C. otherwise　 D. however

20. The door _______ open, no matter how hard Grandma pushed.

A. wouldn’t　 　　　　　 B. couldn’t　　　　 　　 C. mightn’t　　　 D. shouldn’t

19. Reading is to the mind ______ food is to the body.

　 A. that　　　　　　　　　　　　　 B. which　　　　　　　　　　　 C. of which　　　　　　　　　 D. what

18. The training won’t stop until the players reach the point _____ they can perform accurately.

　　　 A. that　　　　　　　　　　　　　 B. where　　　　　　　　　　　 C. how　　　　　　　　　 D. when

17. How many men does your uncle _____ for him?

A. have worked　　　　　　 B. have to work　　 C. have working　　 D. have been working

16. ---Remember the first time we met, Susan?

　 ---Of course I do. You _______ in the library.

　　 A. read　　　　　 　　　　　　　 B. had read　　　 　　　 C. were reading　 　 D. would read

15. -- Show me your permit, please.

　 -- Oh, it's not in my pocket. It ________ out of my pocket.

　 A. might fall　 　　　　　　　　　　　　　B. could fall

　 C. should have fallen　　　　　　　　　 　　D. must have fallen

14．It is to be 　　　　　that your health is 　　　　　since you’ve been sitting by the desk all day long.

　　　 A．expecting; suffering　　　　　　　　　　　　　　 B．expected; suffering

　　　 C．expecting; suffered　　　　　　　　　　　　　　　 D．expected; suffered

13．We are living in an age 　　　　　many things are 　　　　　on computer.

　　　 A．when; done　　　　 B．that; being done　　 C．that; doing　　　　　 D．when; doing

12．Nobody 　　　　　　seen the film. It’s a pity.

　　　 A．but Tom and Jack have　　　　　　　　　　　　 B．except Tom and Jack have

　　　 C．but I have　　　　　　　　　　　　　　　　　　　　　 D．but my friends has