单项选择题

The modern society requires that young people solve the problems ______ their own.

A. of
B. for
C. on
D. to
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单项选择题
She has______her mind and is going to Canada instead of Japan.
A. exchanged
B. decided
C. changed
D. made
单项选择题
You have nothing to do. ______, I have lots of things to do.
A. On the whole
B. On the contrary C. On the way
D. On the other
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