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單項(xiàng)選擇題

Please switch（）the power right away.

A.in
B.up
C.on
D.over

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Please tell me（）to put the bleaching powder.

A.whom
B.what
C.which
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Please tell the stevedores to load the cargo（）according to the respective figures.

A.tightly
B.closely
C.securely
D.strictly

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