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—How long will it be ________ the professor makes another visit to China?

—It all depends.

A.until 

B.before

C.since 

D.when

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“Sorry, sorry...”,he whispered, ________ talking to himself.

A.while 

B.even if

C.a(chǎn)s if 

D.when

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Scientists say it may be one year or so ________ it is possible to test the new medicine on human patients.

A.when 

B.a(chǎn)fter

C.before 

D.since

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He had to be called two or three times ________ he would come to his dinner.

A.while 

B.a(chǎn)s

C.before 

D.until

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There have been fewer accidents on this highway ________ the speed limit was introduced.

A.before 

B.while

C.a(chǎn)fter 

D.since

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—Our holiday  cost a lot of money!

—Did it? Well, that doesn't matter________you enjoyed yourselves.

A.a(chǎn)s long as 

B.unless

C.a(chǎn)s soon as

D.though

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—How about camping this weekend,just for a change?

—OK,________you want.

A. whichever 

B. however

C. whatever 

D. whoever

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________they decide which college to go to, students should research the admission procedures.

A. As        

B. While  

C. Until         

D. Once

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The girl had hardly rung the bell______the door was opened suddenly,and her friend rushed out to greet her.

A. before     

B. until 

C. as         

D. since

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Jack wasn't saying anything, but the teacher smiled at him________ he had done something very clever.

A.a(chǎn)s if               

B.in case

C.while                      

D.though

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