单项选择题

So many children have bought the balloons that the store is now out of ______ .

A．stuff
B．material
C．stock
D．staff
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单项选择题
Your complaint is being ______ ; when we have anything to report we'll write to you again.
A．looked through
B．looked over
C．looked after
D．looked into
单项选择题
The pollution question as well as several other issues is going to be discussed when the Congress is in ______ again next spring.
A．assembly
B．conference
C．convention
D．session
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