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Recently people have made great progress in using ____ power of nature to produce____ electricity.

A．a; the

B．/; /

C．the; /

D．a; an

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By 16:30, ______was almost closing time, nearly all the paintings had been sold.

A．which

B．when

C．what

D．that

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We look forward to the day when the motorcar has been replaced by some less dangerous ______of transport.

A．means

B．methods

C．manners

D．ways

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It took him a long time to ______the skills he needed to become a professional artist.

A．acquire

B．inquire

C．require

D．request

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I’m so glad you’ve come here to ______this matter in person.

A．lead to

B．see to

C．turn to

D．refer to

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