单项选择题

The Space Age ______ in October 1957 when the first artificial satellite was launched by the Soviet Union.

A. initiated
B. originated
C. embarked
D. commenced
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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
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
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