单项选择题

You very likely give other passengers a quick glance to size them up and to ______ them that you mean no threat.

A．issue
B．assure
C．certify
D．rectify
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单项选择题
Over the years, more money has been put into education, but ______ in certain areas little has been achieved.
A．gravely
B．regrettably
C．forcibly
D．graciously
单项选择题
It was no ______ that his car was seen near the bank at the time of the robbery.
A．coincidence
B．convention
C．certainty
D．complication
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