单项选择题

They joined the army willingly.（）

A. intentionally
B. consciously
C. voluntarily
D. reluctantly

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单项选择题

He boasted that he was the best swimmer in his school.（）

A. bragged
B. alleged
C. claimed
D. praised

单项选择题

Techniques to employ the energy of the sun are being developed.（）

A. convert
B. store
C. use
D. receive

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