单项选择题

Frank's lessons were too hard for him, and he soon fell______the rest of the class.

A．behind
B．down
C．off
D．away from
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单项选择题
Some cities have passed laws that allow coal and oil______only if their sulfur content is low.
A．burning
B．to burn
C．being burned
D．to be burned
单项选择题
It is time to______fields in which they are just as capable as men.
A．keep women's
B．stop to keep women out
C．keep women away
D．stop keeping women out of
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