Not only is sleep necessary for your body, it’s important for your brain, too.______kids between 13 and 20 get about 8 hours a night,______experts agree that some kids need more than others. When your body doesn’t have enough hours to______, you may feel______or crazy, or you may be unable to think clearly. You______have a hard time following directions, or you might have an argument with a friend over______really silly. A school task that’s normally easy may feel______, or you may feel it hard to play your favorite sport or instrument.

One more reason to get enough sleep: If you don’t, you may not grow______. That’s right. Researchers believe too little sleep can______growth and your immune system（免疫系統(tǒng)）, which______you from getting sick.

1.A. Many B. Most C. Some D. Any

2.A. but B. and C. so D. or

3.A. work B. job C. rest D. food

4.A. happy B. excited C. tired D. relaxed

5.A. must B. will C. can D. might

6.A. things B. something C. everything D. somebody

7.A. worried B. surprised C. impossible D. possible

8.A. as well B. too fast C. all along D. by yourself

9.A. change B. realize C. affect D. increase

10.A. helps B. teaches C. tells D. keeps

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