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This new kind of chemicals will help keep the air, soil and water________ from pollution．

A．free

B．empty

C．loose

D．short

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A．other than; keep	B．rather than; stand
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Not until I dropped off from school ____ how much time I had wasted.

A．didn't I realize	B．did I realize
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—Oh, dear, if you _____.

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A．until

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