1.______suggest that students should have 9 hours’ sleep every night.

A. Parents B. Teachers C. Scientists

2.What can cause problems in a student’s study?

A. Quarreling with their parents. B. Arriving late for class.

C. Falling asleep in class.

3.Most students feel nervous and forgetful because ______.

A. they worry about their studies B. they don’t get enough sleep

C. they often get lower grades

4.When should many students go to sleep ?

A. After 12 am. B. Before 11 pm. C. At about 9 pm.

5.Most students go to bed late because ______.

A. there may be too much noise in his room

B. there may be a parent in his room

C. there may be a computer in his room

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