单项选择题

The captain of the ship ______ the passengers that there was no danger.

A. assured
B. ensured
C. secured
D. insured
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单项选择题
The government is trying to do something to ______ better understanding between the two countries.
A. raise
B. promote
C. rise
D. develop
单项选择题
Children don't ______ understand what are reciting, but gradually it will have in impact on thinking.
A. necessarily
B. profitably
C. unnecessarily
D. unprofitably
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