单项选择题
We tried to ______ the nervous old lady that flying was safe.
A．secure
B．ensure
C．assure
D．certify
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单项选择题
With a school record like yours, ______ why you didn ' t try for a university scholarship.
A．I' m shocked
B．I' m puzzled
C．I' m amazed
D．I feel pity
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单项选择题
The speed ______ is 340 meters per second.
A．at which sound travels
B．with which sound travels
C．of which sound travels
D．for which sound travels
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