4. B.

3. A. 动词不定式作want 的宾语, sound 为系动词,无被动形式

2. A. be not to blame for

1.A　 stand 承受

50. Having a trip abroad is certainly good for the old couple, but it remains _____ whether they will enjoy it.

A. to see　 B. to be seen　 C. seeing　　 D. seen

Key:

49.It has been raining every day so far. I hope tomorrow will ______ fine.

A. turn up　 B. turn to　 C. turn out　 D. turn into

48. –Is it good to look up every new word when I come across it in reading?

　--No,. You don't have to because you are ____ to guess the meaning from the context.

A. possible　 B. likely C. probable　 D. possibly

47. I think Tom, _____ you, ______ to blame.

A. rather than, is　 　　B. rather than, are

C. more than, are　 　　D. majority, did

46. Who would you like _______ the classroom?

A. to have clean　 B. having cleaned　 C. to have cleaned　 D. having to clean　

45. They made the longest sofa in the world. It is ten times ______ the ordinary ones.

A. the length of　 B. so long as　 C. much longer than　 D. as length as