单项选择题

A．Go to summer school.
B．Take a vacation,
C．Stay at home.
D．Earn some money,
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单项选择题
A．At a supermarket.B．At a bar.C．At a library.D．At a dormitory.
A．At a supermarket.
B．At a bar.
C．At a library.
D．At a dormitory.
填空题
The indication of a river that must flow down at each step for the essayist is ______.
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