单项选择题

（） , a TV set is in use in every home for about six hours each day.

A．It is average
B．The average that
C．On the average
D．On average

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The mail was ______ for a week because of the flood.
A．held in
B．hold on
C．hold off
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The Chinese people will never forget those foreign friends, who ______ down their lives for the cause of the liberation of 4hina.
A．has laid
B．had laid
C．laid
D．would have laid
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