50. The other day, my brother drove his car down the street at _________ I thought was a dangerous speed.

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

49. The road is covered with snow. I can’t understand______ they insist on going by motor-bike.　

　　　 A .why　 　 B. whether　 　 C .when 　 D .how

48. You are saying that everyone should be equal, and this is ______ I disagree.　

　　　 A .why　 　 B. where 　 C .what　　 　　 D .how

47. After Yang Liwei succeeded in circling the earth, _______ our astronauts desire to do is walk in space.　

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

46. Parents are taught to understand ______ important education is to their children’s future.　

A. that　　　　 B. how　 　 C. such　 　D. so

45. This is the house in _______ I was born thirty years ago.

　A. it 　B. there 　　C. which 　　　D. that

44. Last night we saw two movies, _______ was interesting.

　A. both of which 　　　　B. neither of which

　C. both of them 　　　　　D. neither of them

43. She is just the girl, with _______ my brother came to visit me last month.

　A. whom　 　B. her 　　　　C. that 　　　D. who

42. I'll never forget the day _______ I bought my own guitar with my own money.

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

41. There are three girls in the room, ________ is Tom's sister.

　A. the tallest of which 　　　　B. the tallest of whom

　C. tallest of that 　　　　　　D. tallest of which