单项选择题

______ your work in case you've made any mistakes.

A．Take care of
B．Ensure
C．Look out for
D．Check
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单项选择题
Whether a gun is a weapon of offence or a weapon of ______ depends on which end of it you are at.
A．defense
B．attack
C．assault
D．defeat
单项选择题
Some criminal slang is so highly developed that pickpockets, for example, can ______ a conversation in front of a victim without the person's realizing that they are discussing.
A．carry on
B．carry away
C．carry out
D．carry off
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