单项选择题

This latest outbreak of violence is a clear ______ of discontent in the city.

A．manifestation
B．expression
C．demonstration
D．revelation
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单项选择题
One reason for the success of Asian immigrants in the U.S. is that they have taken great ______ to educate their children.
A．efforts
B．pains
C．attempts
D．endeavors
单项选择题
It is unlikely that enough qualified teachers will be found unless there is ______ improvement in salaries and conditions of housing.
A．innumerable
B．subtle
C．extensive
D．substantial
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