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During the day we work and play, and at night we sleep. Our bodies rest while we are __11__. In the morning we are ready____12___ again. Our bodies grow ____13____ while we are asleep. Children who are tired usually ___14___ sleep. We can get better at our lessons ___15___ 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 ____16___ when we sleep. If we do not get enough fresh air, we ____17___ tired when we wake up. While in bed we must not cover our ____18___. Our lungs(肺) need to get enough fresh air. If we ___19___ 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 ___20___ must get plenty of sleep. ( )11.A.asleep B. sleep C. rest D. play ( )12.A. to work and play B. working and to play C. to work and playing D. working and playing ( )13.A. much B. more C. most D. slow ( )14.A. can B. may C. need D. must ( )15.A. while B. before C. as D. after ( )16.A. air B. sun C. water D. food ( )17.A.felt B. will feel C. are feeling D. has felt ( )18.A. foot B. arm C. head D. body ( )19.A. open B. close C. draw D. use ( )20.A. happy B. interested C. helpful D. healthy | 
