— Will you take a message ___ Li Ping?— Sure. Go ahead.
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I have learned English for three years. I can write letters ___ English now.
A. on
B. in
C. of
When some body makes mistakes, we should not laugh ___ him.
A. to
B. at
C.on
The Chinese people ___ hard-working and friendly.
A. are
B. has been
C. is
Ten thousand dollars ___ a large sum.
A. is
B. have been
C. are