Itisnecessarythatthegovernment

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It is necessary that the government solutions for the problems of air pollution to create a clear environment.

A．should have found	B．could have found
C．could find	D．should find

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__________ these tips, and your time _______ doing research on the Internet _________ much worthwhile.

A．Following, will spend, is	B．Followed, spent, was
C．Follow, spent, will be	D．To follow, spending, has been

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While doubts about the medicine’s safety have____________, interest continues to grow.

A．dropped out

B．fell down

C．withdrew from

D．faded away

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Do you know in what circumstances was it____________ Jack achieved his goal?

A．how

B．where

C．when

D．that

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If penicillin _____________ available, many people ______________ from sickness.

A．weren’t , would have died	B．shouldn’t be, would die
C．hadn’t been, would have died	D．is, will die

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Another drug that has helped improve people’s health is penicillin, _________ is _________ by many _________ one of the most important medicines.

A．which, considered, being	B．that, considering, been
C．that, to consider, being	D．which, considered, to be

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