23.C　提示：keep on意为"继续"。keep off意为"使离开"。keep up意为"保持，维持"。try to do sth意为"努力做某事"；try doing sth.意为"试着做某事(看行不行)"。

22.D　提示：be used to(sb. 's)doing sth.习惯于(某人)做某事。

21.D　提示：by weight意为"论重量，以斤两计"。by the dozen意为"论打计"。

35.- Thank you for your CD - ROM. I'll return it as soon as I can.　 - ________. I've got another one to spare.

A. No problem　　　　　 B. No hurry　　　 C. With pleasure　　 D. Nothing much

1答案

34.In this university a medal with ten thousand dollars ________gains success in science and technology every two years .

A. is given to whoever　 B. are given to anyone who　 C. gives to whomever　　 D. give to everyone

33.If the launch in 2005 is successful, China will be the third country ________its astronauts into space.

A. will send　　　　　 B. having sent　　　 C. sending　　 D. to send

32.- Why weren't you at school yesterday morning, Li Lei?　 - ________, sir.

A. Yes, I was　　　　　 B. No, I was　　　 C. Neither was I　 D. But I was

31.The thing that ________ is not whether you fail or not, but whether you try or not.

A. cares　　　　　　　 B. minds　　　　 C. matters　　 D. depends

30.- Why not take my car to the museum instead of walking?　 - No, thanks. ________.

A. I'm used to　　　　 B. I'm able to　　 C. I'm about to　 D. I've got to

29.- The winner of the race is a tall and thin boy with thick glasses.

- Then it ________ be my friend, Mike, who looks like a "meat ball".

A. mustn't　　　　　 B. can't　　　　　　 C. might　　　　 D. should