补全句子．

________　________ is this?(这是谁的篮球？)

根据短文内容选词填空。

　　Early to bed, early to get up makes a man healthy．　　1　　 is an old English saying．Have you ever 　　2　　 of it? It means that we must go to bed early at 　　3　　 and get up early in the morning．If we do so, we shall be strong．

　　Is this true? Perhaps it is．The body must have 　　4　　 sleep．Children of your age need nine hours or ten 　　5　　 of sleep every night．If you don't go to bed early, you can't do your work well．

　　Some people go to bed late at night and get up late in the morning．This is not 　　6　　 for them．We must sleep at night when it is dark．The dark help us to sleep well．When daytime 　　7　　, we must get up．It is time for exercise．If the body is not used, it becomes weak．Exercise keeps it strong．Exercise helps the blood(血液)to move around inside the body．This is very important．Blood takes food to all parts of our bodies．The brains in our head also 　　8　　 blood．We think with 　　9　　 brains．If we take exercise and keep our bodies 　　10　　, we can think better．

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