单项选择题

Before the child went to bed, the father asked him to______all the toys he had taken out.

A．put off
B．put up
C．put away
D．put out
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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
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
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