49. His ability has never been in doubt ― the question is ______ he is prepared to work hard.

A. whether　　　 　　　　　　　　 B. if

C. that　　　 　　　　　　　　　　 D. where

48. All I want to say is _______ we need more time.

A. this　　　　 　　　　　　　　　 B. it

C. that　　　 　　　　　　　　　 D. which

47. She knew nothing about his journey _______ he is likely to be away for three months.

A. except　　　 　　　　　　　　　 B. except for

C. except mm　 　　　　　　　　　 D. in addition

46. Having traveled eight hours on end, we finally reached ______ is now a big city.

A. which　　　 　　　　　　　　 B. what

C. where　　　 　　　　　　　　　 D. it

45. We believe ________ you have been devoted to _______ naturally of great necessity.

A. that; being　　 　　　　　　　　 B. all that; be

C. that all; are　 　　　　　　　　 D. what; is

44. Why don't you bring _________ to his attention that you are too busy to do it?

A. this　　　　 　　　　　　　　　 B. that

C. what　　　 　　　　　　　　　 D. it

43. Mr. Brown said that he was always right, then I discovered, _________ was news to me, to _____he was wrong.

A. which; because　　　　　　 　　 B. which; as

　　 C. what; that　　　　　　　 　　　 D. it; that

42. Scientists believe native Americans arrived by crossing the land bridge that connected Siberia and _______ more than 10,000 years ago.

A. this is Alaska 　　　　　　　　　 B. Alaska is now

C. is now Alike　 　　　　　　　　 D. what is now Alaska

41. Professor Lee’s book will show you _____ can be used in other fields.

　　 A. that you have obeyed　　　　 　 B. how that yon have observe

　　 C. how that you have observed　　　 D. how what you have observed

40. It was not until dark _____ he found _______ he thought was the correct way to solve the problem.

A. that; what　　 　　　　　　　　 B. that; that

C. when; that　 　　　　　　　　　 D. wheal what