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 scientist Galileo claimed that the earth ______around the sun.
A. moves
B. moved
C. is moving
D. was moving
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
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