21. I was really anxious about you. You home without a word

　　A. mustn’t leave B. shouldn't have left

　　C. couldn't have left D. needn' t leave

　　22. If you your name and address on the card, we’ll send the book to you as soon as it is retumed.

　　A. go over B. fill in

　　C. find out D.carry out

　　23. Would you like more coffee? I’m sure you would .

　　A. much B. few C. any D.a lot

　　24. These are common materials we are all familiar.

　　A. about which B. of which

　　C. with which D. to which

　　25. of danger, he jumped into the river all at once.

　　A. Because B. In terms C. Instead D. carry out

　　26. When I leave the research institute next week, I there for 18 years.

　　A. shall be working B. will work

　　C. shall have worked D. have worked

　　27. The number of children from l to 15 in different families.

　　A. varies B. seems C. changes D. turns

　　28. In ancient time’s people used to build their houses with materials .

　　A. convenient B. important C. available D. natural

　　29. She agreed without the slightest .

　　A. hesitation B. thinking C. look D. hope

　　30. Is there any they'll ever find a cure for the common cold?

　　A. prospective B. prospect C. prosperity D. prosperous

　　31. Some people are color-blinded and cannot between blue and green.

　　A. distinguish B. differ C. separate D. divide

　　32. knows the name of this song will receive a prize from the radio station.

　　A.One B.Who C. Anyone D. Whoever

　　33. All the countries are customers or customers of the United States.

　　A. potential B.pretended C.preventive D.pretective

　　34. The safety rules are__ anyone.

　　A. applied on B. applied in C. applied for D. applied to

　　35. We got to the station only _ that the train had just left.

　　A. learned B. to learn C. learning D. having learned