单项选择题

______ do their homework carefully.

A．No all the students
B．Not all the students
C．None the students
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Don't ______ while others are speaking.
A．break up
B．break in
C．interrupt with
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Li Ming fell ______ others in English study, but he tried his best to catch up ______ them.
A．behind, on
B．down, with
C．behind, with
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