单项选择题

When they had finished playing, the children were made to ______ all the toys that they had taken out.

A．put off
B．put out
C．put up
D．put away
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单项选择题
The sun warms the earth, ______ makes it possible for plants to grow.
A．this
B．that
C．as
D．which
单项选择题
It is dangerous to ______ out of the window of the train.
A．look
B．lean
C．bend
D．slope
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