做一个完形填空,要有过程（就是为什么要选这个.）
During the day we work and play,and at night we sleep.Our bodies rest while we are __1__.In the morning we are ready____2___ again.Our bodies grow ____3____ while we are asleep.Children who are tired usually ___4___ sleep.We can get better at our lessons ___5___ 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 ____6___ when we sleep.If we do not get enough fresh air,we ____7___ tired when we wake up.While in bed we must not cover our ____8___.Our lungs(肺) need to get enough fresh air.If we ___9___ 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 ___10___ must get plenty of sleep.
( )1.A.asleep B.sleep C.rest D.play
( )2.A.to work and play B.working and to play
C.to work and playing D.working and playing
( )3.A.much B.more C.most D.slow
( )4.A.can B.may C.need D.must
( )5.A.while B.before C.as D.after
( )6.A.air B.sun C.water D.food
( )7.A.felt B.will feel C.are feeling D.has felt
( )8.A.foot B.arm C.head D.body
( )9.A.open B.close C.draw D.use
( )10.A.happy B.interested C.helpful D.healthy