单项选择题

I have to study hard in order to ______ the other students in my class.

A．keep up with
B．keep in touch with
C．put up with
D．keep away from
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单项选择题
If a baby bird stays ______ for two or three weeks after leaving the nest, it has a fair chance of becoming an adult.
A．living
B．lively
C．alive
D．live
单项选择题
You should never ______ your promise to a child.
A．go back on
B．go after
C．go in for
D．go over
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