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 more one is ______ the English-speaking environment, the better he or she will learn the language.
A．exposed to
B．filled in
C．caught on
D．kept on
单项选择题
—What present shall we make Simon for his birthday What kind of things does he like, football, pop music, model planes or ships ... —______ —Let's make him a model plane.
A．It's a good idea
B．That's it
C．That's true
D．That's right
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