单项选择题

（）is forbidden in the meeting-room, but we are allowed in the room for smokers.

A. Smoking, smoking
B. Smoking, to smoke
C. To smoke, smoking
D. To smoke, to smoke

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—Which subject do you like（） —I like chemistry than any other one.

A. better, better
B. best, better
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The foreigners once （）their products to our company at a （）higher price.

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