单项选择题

The society is unstable, full of criminal cases, so you can't be ______ careful.

A. very
B. so
C. too
D. such
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单项选择题
Even when textbooks are ______ through a school system, methods of teaching may vary greatly.
A. commonplace
B. standardized
C. competitive
D. generalized
单项选择题
When he tried to make a ______, he found that the hotel that he wanted was completely filled because of a convention.
A. complaint
B. claim
C. reservation
D. decision
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