题目内容：
Michael
A．It's rude not to tip. B．I do tip, though I don't like it.
C．Tipping shouldn't be compulsory.
D．Tips are essential to servers' survival.
E．If you don't tip, you are punishing the server.
F．I think the current tipping standard is too high.
G．My tip faithfully reflects how good the service is.
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