单项选择题

To prevent flooding in winter the water flowing from the dam is constantly （）by a computer.

A．graded
B．managed
C．conducted
D．monitored

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单项选择题
By signing the lease we made a（）to pay a rent of $ 150 a week.

A．conception
B．commission
C．commitment
D．confinement
单项选择题
Attempts to persuade her to stay after she felt insulted were （）

A．in no way
B．on the contrary
C．at a loss
D．of no avail
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