单项选择题

Reasons for careful teaching range from preventing a child ______ to keeping a child occupied.

A．sinking behind
B．falling behind
C．drawing behind
D．crawling behind
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单项选择题
Weather ______ , the Johnsons will hold an open-air garden party.
A．permits
B．permitted
C．permitting
D．being permitted
单项选择题
The humid continental climate gradually ______ to the continental steppe climate of the Great Plains.
A．give way
B．give away
C．give up
D．give out
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