单项选择题

Please be careful when you are drinking coffee in case you ______ the new carpet.

A. crash
B. pollute
C. spot
D. stain
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We have to ______ our homework right now, or we won't finish it today.
A. go for
B. go out
C. go about
D. go in
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You must have seen the film last night, ______
A. didn't you
B. mustn't you
C. needn't you
D. do you
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