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__________ environmental damage is done, it takes many years for the ecosystem(生态系统) to recover.

A．Even if

B．If only

C．While

D．Once

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We watch the children _______ into the water from the _____ board.

A．diving; diving	B．diving, dived
C．dived; dived	D．dived; diving

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Peter’s jacket looked just the same as Jack’s, but it cost ___________his.

A．as much twice as	B．twice much as
C．twice as much as	D．as twice much as

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A．charge

B．need

C．return

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A．whatever

B．however

C．no matter what

D．no matter how

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-----I stayed up late last night preparing the speech.
-----__________ you look so tired today.

A．No doubt

B．No problem

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