单项选择题

The mayor promised to ______ whether the clash was designed, or it just happened by accident.

A．look after
B．look about
C．look into
D．look ahead
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单项选择题
A teacher should not show ______ for any one of his pupils nor get angry easily with his pupils.
A．expectations
B．fantasies
C．preferences
D．fashions
单项选择题
If you can ______ punctual delivery, we shall place large orders with you.
A．guarantee
B．convince
C．assure
D．ensure
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