54. We shall go ____ you are ready.      

A. while      B. as soon as      C. as       D. since

53. It has not been decided ____ they will leave.

A. why              B. when             C. which              D. what

52. The trouble is ____ we can not find such an expert.

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

51. I am sure ____ you said is true.            

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

50. Would you tell me ____ way I should take?  

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

49. It is quite clear ____ he won't see us.    

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

48. ___ he did it remains a secret.       

A. What       B. Whom       C. Which       D. How

47. That is not ____ I want.         

A. that        B. why              C. what       D. whose

46. Please write me ____ you arrive in New York.

A. as well as              B. so long as           C. as far as          D. as soon as

45.___ I know he will stay here for half a year.

A. as soon as              B. as long as           C. so far as          D. as well as