单项选择题

__________ safety, you must keep all medicines away from children.

A．For the sake of
B．In the event of
C．On account of
D．With reference to
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单项选择题
Tom looked very much __________ when he was caught cheating in the English examination.
A．embarrassed
B．disappointed
C．bewildered
D．discouraged
单项选择题
It is _________ for us to try to decide whether television is a blessing or a curse.
A．elementary
B．initial
C．essential
D．primary
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