More wind power stations will ____________ to meet the demand for clean energy.

A. take up
B. clear up
C. hold up
D. spring up

We have entered into an age _______ dreams have the best chance of coming true.

A. which
B. what
C. when
D. that

Scientists have obtained more evidence ___________ plastic is finding its way into the human body.

A. what
B. that
C. which
D. where

Mr. Smith gradually _____ a knowledge of the subject.

A. attained
B. achieved
C. required
D. acquired

The old lady can't hope to _____ her cold in a few days.

A. get over
B. get off
C. hold back
D. hold up

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