单项选择题

The walls are made of hollow concret blocks.（）　

A. big　　
B. empty　　
C. long　　
D. new

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The manager allocate duties to the clerks.（）

A. assign
B. persuade
C. ask
D. order
单项选择题
Examination papers of the class were marked without bias. （）

A. immediately
B. correctly
C. fairly
D. carefully
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