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—Can you describe _____ it happened?

　　—Yes, I was riding on my bike _____ a car knocked me down from behind.

A. when; as             B. how; as　　　   C. how; when 　　 　     D. how; while

 Sometimes the boy is a bad-tempered child, but he ____ be quite lovely when he wishes．

A. may                          B. can                   C. shall                            D. must

---I was trying to carry out the plan, but I failed.

---Well, you _____, for we were uncertain it would do ____.

A. needn’t do that, in fact                 B. needn’t have done, in effect      

C. needn’t have, in practice                      D. needn’t, in time

It was foolish of him to ____his notes during such an important test, and as a result, 

    he got punished. 

  A. point to            B. keep to          C. stick to            D. refer to

 Many a man and many a woman _____ that he or she had better education．

A. wish              B. has wished            C. do wishes                 D. have wished

 _____ it is _____ you obtain, you should share _____ your parents your feelings.

A. What; /; to                        B. Whichever; that; with      

C. Whatever; that; with                 D. Which; /; to

About ____ gene-targeting drugs are already in testing pipeline. It won’t be long ____ they are put into effect.

A. two dozen; before  B. two dozens; that  C. two dozens of; before   D. dozens; that

People take naps at noon in warmer climates, ____ the heat makes work difficult in the early afternoon. 

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

--- What do you think of this novel?

   --- Er … sorry. I _____. What did you say?

A. didn’t listen       B. hadn’t listened       C. haven’t listened            D. wasn’t listening

At the conference, people of different _______ were given a chance to exchange theirs with each other. 

A. points          B. manners        C. views              D. ways