Howmanymoredecadeswillhavetopa

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How many more decades will have to pass ____ scientists succeed in providing a cure for cancer?

A．when

B．since

C．before

D．until

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Just in front of our house _______ with a history of 1,000 years.

A．does a tall tree stand	B．stands a tall tree
C．is standing a tall tree	D．a tall tree stands

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I don’t like any humor in serious speech because I can’t think of any circumstance _______ this would be beneficial or useful.

A．where

B．which

C．whether

D．as

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—I’m terribly sorry to have put you through so much trouble.
—____. I know you didn’t mean to.

A．You’re welcome	B．No trouble
C．All right	D．Forget it

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________ had Mike picked up the ball________ another player took it from him.

A．Hardly; when	B．Not; until
C．No sooner; when	D．Not until; when

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If only he________ quietly as the doctor instructed, he would be better now.

A．lies	B．should lie
C．had lain	D．laid

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