单项选择题

The pilot asked all the passengers on board to remain ______ as the plane was making a landing.

A．seat
B．seating
C．seated
D．to be seating
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单项选择题
The pianos in the other shop will be ______, but ______.
A．cheaper; not as better
B．more cheap; not as better
C．cheaper; not as good
D．more cheap; not as good
单项选择题
Only when in danger ______ human beings.
A．snakes will most attack
B．most snakes will attack
C．will most snakes attack
D．will attack most snakes
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