Onlywhenthevillagerswerefacedw

Only when the villagers were faced with water shortage___ how serious the problem of water pollution was．

A．did they realize

B．will they realize

C．they did realize

D．were they realized

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The more one is ______the English-speaking environment, the better he or she will learn the language.

A．exposed to

B．filled in

C．caught on

D．kept up

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— Have you finished your composition already?
　— Yes. I ______ it in twenty minutes.

A．have finished

B．finished

C．will finish

D．had finished

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A．turned up

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A．when

B．that

C．who

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It’s so surprising to hear from my school teacher again. ______, we last met more than twenty years ago.

A．That’s to say

B．What’s more

C．Believe it or not

D．In other words

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