单项选择题

The police tried in vain to break up the protest crowds in front of the government building.

A．unskillfully
B．violently
C．ineffectively
D．eventually
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单项选择题
Their business flourished at its new location a year later owing to their joint efforts and hard work.
A．prevailed
B．failed
C．boomed
D．shrank
单项选择题
To absorb a younger work force, many companies offered retirement plans as incentives for older workers to retire and make way for the younger ones who earned lower salaries.
A．rewards
B．opportunities
C．motives
D．stimuli
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