单项选择题

I can't ______ what I am doing because it is so noisy here.

A．concentrate
B．concentrate in
C．concentrate on
D．concentrate about
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单项选择题
Mary is always ______ with her neighbors, wherever she lives.
A．on good term
B．on good terms
C．in good term
D．in good terms
单项选择题
The old lady cannot ______ herself ______ the idea that somebody is following her all the time.
A．free ... with
B．free ...of
C．free ... out
D．free ... away
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