单项选择题

The students are encouraged to provide ______ service to the poor students.

A．valuable
B．indispensable
C．voluntary
D．initial
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单项选择题
We ______ the shops and the post office as soon as we moved into the town.
A．located
B．assigned
C．delivered
D．placed
单项选择题
Wind and rain ______ in through several tears in the plastic roof.
A．leaked
B．cracked
C．split
D．output
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