单项选择题

The United States is composed of 50 states , two of which are separated from ______ by land or water.

A．others
B．other one
C．the others
D．another
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单项选择题
The persons that have the greatest influence ______ children are their teachers.
A．in
B．for
C．to
D．on
单项选择题
It was essential that all the necessary documents ______ to the president's office before the end of this month.
A．be handed in
B．must be handed in
C．should hand in
D．had been handed in
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