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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单项选择题
After two years of bargaining, the leaders of two countries finally ______ an agreement.
A．made
B．reached
C．joined
D．came
单项选择题
The Youth Centers set up by the city government have ______ those young people to spend their time wisely.
A．prohibited
B．enabled
C．made
D．had
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