Moremoneywhenweusebothsidesofp

More money ____________ when we use both sides of paper.

A．will save

B．was saved

C．has saved

D．will be saved

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They hoped ________ the secret forever.

A．keep

B．kept

C．keeping

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—________.

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A．is built	B．was built
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A．can’t

B．shouldn’t

C．mustn’t

D．needn’t

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—Because we ________ for three hours without stopping.

A．work	B．worked
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