单项选择题

As a policeman, Mr. Brown thought that he had a duty to ______ the lost children in finding their homes.

A．assist
B．help
C．provide
D．support
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单项选择题
The book you want is not ______ now. I will let you know as soon as it is returned to the library.
A．useful
B．possible
C．available
D．practical
单项选择题
Having entered the room, little Hans noticed many of the villagers ______ at the back of the classroom.
A．seat
B．seated
C．seating
D．to seat
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