单项选择题

I am sure to tell you that there's no danger.

A．ensure
B．assure
C．insure
D．secure
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单项选择题
Gas does accumulate in the mines around here.
A．increase
B．spread
C．collect
D．grow
单项选择题
Unfortunately, the rate of his expenditure surpasses that of his income.
A．precedes
B．dominates
C．exceeds
D．prevails
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