lifewillcontinueontheearthform

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life will continue on the earth for millions of years to come will depend on the problem of pollution can be solved.

A．How /whether

B．That/that

C．Whether / if

D．Whether / whether

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Tom tried to __________ in German.

A．understand himself	B．make himself understanding
C．make himself understood	D．make himself understand

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I wonder how many years ago ___________.

A．did your father retire	B．has your father retired
C．your father retired	D．your father has retired

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He said that he would write to us but so far we ___________ from him.

A．didn’t hear

B．haven’t heard

C．shouldn’t have heard

D．hadn’t heard

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__________ good exercise.

A．Climbing hills is	B．Climbing the hill is
C．The climbing hills are	D．The climbing of hills are

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I don’t know who invented __________ telescope, but I think it is __________ most
useful invention.

A．the, the

B．the, a

C．a, the

D．a, a

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