31. ----Jack, can you make a sentence to ________ the meaning of the new phrase?

　 ----Well…

A. show off　　　　　　　　　 B. turn out　　　　　 　　　 C. bring out　　　　　　　 D. take in

30. My sister met him at the Grand Theatre yesterday afternoon, so he _______ your lecture.

A. couldn't attend　　　 　　　　　　　　　　　 B. mustn’t have attended

C. shouldn't attend　　 　　　　　 　　　　D. couldn’t have attended

29. China’s new food law provides for a food recall system _______ producers have to stop production if their food isn’t up to standards.

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

28. Can you imagine that rats eat 40 to 50 times _______.

　 A. by weight　　 B. their weight　　 C. in weight　　 D. of their weight

27. How long do you think _______ the computer company turns out a new product?

A. it will be that 　　　 B. will it be until　 　　 C. will it be since　　　 　 D. it will be before

26. ----Hello. May I speak to Bill, please?　

---- ________.　　　　 　 　A. Bill speaking　　　　　B. I’m Bill　 　C. You are speaking to Bill　　　　　　D. I’m speaking

25. ---- Good morning. How much should I pay for these books ________ to Alabama?

　 ---- Hm, about ten dollars.

　 A. to be sent　　　 　　B. being sent 　 　　　 　　C. sent　　 D. having been sent

24. ---- You won't go to Kathy's wedding party, will you?

　 ---- Yes, ________ invited.

　 A. though　　　　　　 　B. if　　　　　　　　 C. unless　　　　　 D. as

23. ----Mike, the telephone is ringing.

　 ---- I 　_ _　　 　answer it.

A. will　　 　　　　　　 　　　 B am going to　　 　　 　　　 C. am to　　　 　 　D. am about to

22. Lawrence Craven, a doctor from the USA, is the author of several published reports, one of _______ introduced the idea in 1953 _______ aspirin could reduce the risk of heart attacks.

A. them; when　 　　 　　　 B. which; that　　　 C. what; that　　　 D. which; when