单项选择题

When you read the book, you'd better make a mark ______ you have questions.

A．which
B．at where
C．the place where
D．where
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It is everybody's ______ to keep the city clean.
A．matter
B．affair
C．business
D．thing
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—I'm going to the post office. — ______ you axe there, can you get me some stamps
A．As
B．While
C．Because
D．If
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