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
None of us expected the president to ______ at the party. We thought he was still in hospital.
A. turn in
B. turn down
C. turn out
D. turn up
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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