Thelightwillbethrownthecauseof

The light will be thrown ______ the cause of cancer by research that is now in progress.

A．to

B．upon

C．in

D．for

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Mary and I see each other ______, but not as often as we used to.

A．sooner or later

B．in a while

C．sometime

D．now and then

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A．show off

B．go up

C．fit in

D．come over

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A．ring over

B．ring off

C．ring out

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Jack went back home after a heated discussion, _______.

A．annoyed and tired	B．annoying and tired
C．annoyed and tiring	D．annoying and tiring

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Mary can speak Chinese fluently, _____ impressed me most.

A．why

B．that

C．where

D．which

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