单项选择题

We are studying English hard ______ our country better in the future.

A. serve
B. to serve
C. serving

D. served
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单项选择题
He was very foolish to ______ like that.
A. behave
B. do

C. tell

D. make
单项选择题
Her great personal ______ makes her a very popular member of the staff.
A. charm
B. charms
C. charming

D. charmed
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