单项选择题

Many a student and teacher ______ making a careful study of ______ own problems.

A．are...their
B．is...their
C．are...is
D．is...his
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单项选择题
The teacher doesn't permit ______ in class.
A．smoke
B．to smoke
C．smoking
D．to have a smoke
单项选择题
When Mr. Jones gets old, he will ______ over his business to his son.
A．take
B．hand
C．think
D．get
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