hashelpedtoprotecttheenvironme

____ has helped to protect the environment is worth praising.

A．Who

B．The one

C．Anyone

D．Whoever

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The computer system broke _____ suddenly while he was searching for information on the Internet．

A．down

B．out

C．up

D．in

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A．when

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A．must

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C．should

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—Even if she _____ a lot of studying, she would have preferred staying home to going shopping．

A．didn’t have	B．shouldn’t have
C．hadn’t had	D．hasn’t had

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A．done

B．to do

C．doing

D．being done

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