50.　 I really don’t know ______ about it.

　 a. what to do b. how to do c. to do what d. how can I do

49.-What is a writing brush, do you know?

　 -It’s used ______ writing and drawing.

　 a. with 　b. to 　　c. for 　　d. by

48. We could see nothing because the lights suddenly ______.

　 a. went on　 　b. went over 　c. went down　 　d. went out

47.The mountain was ______ steep ______ few people in our city reached the top.

　 a. so; as 　　b. so; that 　　c. as; as 　　d. too; to

46.The war was over about three months ago, ______ the American soldiers in iraq are still having a lot of trouble to deal with.

a. or 　　b. and　　 　c. but　　 　d. so

45. -Which sweater do you prefer, the yellow one or the pink one?

　-______. I like a light blue one.

　 a. either 　　b. both　 　c. any 　　d. neither

44. Jim has made many friends since he ______ to china.

　 a. came 　　b. comes　 　c. has come 　　d. will come

43. Which is ______ to learn, fishing or swimming?

　 a. easy 　　b. easier　　 　c. the easier 　　d. more easily

42.We should keep ______ in the reading –room.

　 a. quiet 　　b. quietly 　　c. quite 　　d. quickly

41.　 The old woman kept one black dog and two white ______.

　 a. one 　　b. ones 　　c. those 　　d. one’s