单项选择题

All the children were well mannered and ______ toward the guests.

A．respecting
B．respective
C．respectable
D．respectful
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单项选择题
Californians and New Englanders speak the same language and ______ by the same federal laws.
A．sustain
B．stand
C．abide
D．conform
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
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