单项选择题

I ______ you that there' s no danger.

A．ensure
B．assure
C．insure
D．secure
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单项选择题
Physical attractiveness is not an important ______ in some people' s opinion.
A．ascribe
B．attribute
C．tribute
D．trains
单项选择题
Before they started to work, I asked the worker to give me an ______ of the cost of building the house.
A．assessment
B．estimate
C．evaluation
D．measurement
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