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
Although he has lived with us for years, he ______ us much impression.
A．hadn't left
B．didn't leave
C．doesn't leave
D．hasn't left
单项选择题
The three sisters decided to hold a family party to ______ their parents' silver wedding.
A．celebrate
B．memorize
C．congratulate
D．welcome
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