It might have been John ______bought a new book for Mary yesterday.

A. what     B. since    C. that    D. then  

Personally I think it is the sales manager, rather than the sales girls, who______ to blame.

      A. is             B. are           C. were     D. was

It is not luck but difficulties that____    him success.

      A. makes             B. make     C. made          D.  had made

This is the farm ____ he used to work.

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

 It is almost five years ______ we saw each other last time.

A. before               B. since                 C. after                 D. because

－Why didn’t you tell him about the meeting?

－He rushed out of the room ______ I could say a word.

A. before               B. until                  C. when                D. after

Scientists say it may be five or six years ______ it is possible to test this medicine on human patients.

A. since                B. after                  C. before               D. when

He made a mistake, but then he corrected the situation ______ it got worse.

A. until                  B. when                C. before               D. as

It was not ______ she took off her dark glasses ______ I realized she was a famous film star.

A. when; that         B. until; that                  C. until; when        D. when; then

 A good storyteller must be able to hold listeners’ curiosity ______ he reaches the end of the story.

A. when                      B. unless               C. after                 D. until