57. That is _____ we decided to put the discussion off.

A. where　　　　 B. which　　　　 C. that　　　　　　　　　 D. why

56. That's_____.

A. how she did it　　　　　　　　　　　　　　　　 B. that how did she do it.

C. how did she do it　　　　　　　　　　　　　 D. what she did it

55. It looked ____.

A. as if it was going to rain　　　　　 B. that as if it was going to rain

C. as if was it going to rain　　　　　 D. as if that it was going to rain

54. They are just _____.

A. that what shall I have　　　　　　　　 B. what shall I have

C. that I shall have what　　　　　　　　 D. what I shall have

53. That's_____.

A. how did I become a teacher　　　　　　 B. how I became a teacher

C. how a teacher I became　　　　　　 D. that I became a teacher

52. Water will continue to be _____ it is today next in importance to oxygen.

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

51. The questions is _____.

A. whether is it worth doing　　　　 B. that if it is worth doing

C. whether it is worth doing　　　　 D. if it is worth doing

50. That is _____ .

　　　 A. where lived he there　　　　　　　　 B. where did he live

　　　 C. where he lived　　　　　　　　　　　　 D. that where he lived

49. That’s _____ .

　　　 A. where our differences lie　　　　 B. our differences lie there

　　　 C. where do our differences lie　　 D. that where our differences lie

48. That’s _____ I want to say.

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