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
Driving straight ahead, and you will see a ______ to the New Expressway.
A．signal
B．mark
C．sign
D．board
单项选择题
There has been a ______ increase of complaint about the matter because of misunderstanding.
A．regretting
B．regretted
C．regretful
D．regrettable
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