单项选择题

The professor requests that we ______ the term papers by the end of this month.

A．will hand in
B．will have handed in
C．to hand in
D．hand in
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单项选择题
The American Red Cross is one of the volunteer organizations ______ purpose is to help the sick and the needy.
A．its
B．that
C．who
D．whose
单项选择题
It is natural that one's attitude ______ his family changes as he grows older.
A．for
B．at
C．of
D．towards
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