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阅读下面短文，按照句子结构的语法性和上下文连贯的要求，在空格处填入一个适当的词或使用括号中词语的正确形式填空。

Early to bed, early to rise, makes a man healthy, wealthy and wise.

This is ______ old saying. Have you ______ (hear) of it before? It means that we should go to bed early and ______ up early in the next morning. By ______ (do) this, we will be in good health. And we'll also be rich and clever.

It's true that ______ (we) bodies need to have enough sleep to be healthy. ______ (child) should have a ten-hour sleep every night. Those who do not have enough sleep can't do their work very well. They will not be clever and they may not get wealthy in the future.

The body needs exercise as well. Walking, running, jumping, ______ (ride) bikes and playing games are all exercise.

Exercise ______ (help) to keep the body strong and fit. It ______ helps to keep the blood to move around inside the body. The blood takes the food ______ all parts of the body. The head needs blood, too. So exercise helps people think better.