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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单项选择题
Buck Helm, a retired salesman, survived ______ alive for 90 hours in his car.
A．burying
B．having buffed
C．being buffed
D．to be buried
单项选择题
Life is a candle ______ to bum ever brighter.
A．being meant
B．meaning
C．to mean
D．meant
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