单项选择题

Every society has its own peculiar customs and ______ of acting.

A．ways
B．behavior
C．attitudes
D．means
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单项选择题
You ______ a tip if you're not satisfied with the service.
A．mustn't leave
B．must leave
C．can leave
D．don't have to leave
单项选择题
I'm at my wits' end. Tell me to do.
A．how
B．what
C．when
D．why
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