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
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In case of something unexpected, it is advisable to ______ your life against accident.
A. insure
B. ensure
C. assure
D. be sure
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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