单项选择题

The smile on his face shows that he is ______ his students' work.

A． worded about
B． pleased with
C． sorry for
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单项选择题
When you don't know what to do next, never give up, just ______. working out your problem.
A． carry on
B． make sure
C． try out
单项选择题
It's a funny ______ to make a pen with a machine in it.
A． idea
B． trouble
C． story
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