单项选择题

A．To urge children to get enough sleep.
B．To relieve the burden of school children.
C．To dissuade teenagers from staying up late.
D．To tell Americans to have 9 hours of sleep every night.
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单项选择题
A．He would like to know what happened.B．Because of what happened, he had no time.C．He can help the woman.D．He would have helped if he had the time.
A．He would like to know what happened.
B．Because of what happened, he had no time.
C．He can help the woman.
D．He would have helped if he had the time.
单项选择题
A．On a Friday night.B．On a Sunday morning.C．Every Saturday evening.D．Not decided yet.
A．On a Friday night.
B．On a Sunday morning.
C．Every Saturday evening.
D．Not decided yet.
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