单项选择题

In case of something unexpected, it is advisable to ______ your life against accident.

A．insure
B．ensure
C．assure
D．be sure
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单项选择题
______ the language in the town, he found it hard to get a piece of work.
A．Not knowing
B．Not know
C．Knowing not
D．Know not
单项选择题
There are lots of trees ______ the river.
A．in either side of
B．in either sides of
C．on either sides of
D．on either side of
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