完形填空
During the day we work and play, and at night we sleep. Our bodies rest while we are ____. In the morning we are ready_______ again. Our bodies grow _______ while we are asleep. Children who are tired usually ______ sleep. We can get better at our lessons ______ we have had plenty of rest. Boys and girls who are eight or nine years old need ten hours of sleep every night. Our bodies need plenty of ______ when we sleep. If we do not get enough fresh air, we _______ tired when we wake up. While in bed we must not cover our _______. Our lungs(肺) need to get enough fresh air. If we ______ our windows at night, we can have plenty of fresh air. Cool air is better than warm air. Boys and girls who want to be ______ must get plenty of sleep.
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