单项选择题

The hum of conversation （）as the chairman mounted the rostrum.

A. died out
B. died off
C. died of
D. died away

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People of all countries are expected to ______ the principles of the United Nations and defend the peace in the world.
A. inspect
B. expedited
C. uphold
D. reinstall
单项选择题
It was a long time before the cut on my hand（）completely.

A. healed
B. cured
C. improved
D. recovered
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