单项选择题

I wonder who first _________ the idea of bags with gas to make balloons.

A．imagined
B．conceived
C．cherished
D．concealed
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单项选择题
We note with satisfaction that all these activities have helped to _________ mutual understanding and friendship between our two countries.
A．propel
B．promote
C．strengthen
D．depress
单项选择题
The discontented students _________ by boycotting the school -cafeteria.
A．rewarded
B．vanished
C．groaned
D．took their revenge
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