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There is an old saying: _______to bed and early to rise makes a man healthy, wealthy and wise. It means that we should go to bed early and get up early the next ______. By doing this, we will be ______, and we'll also be rich and clever. It's true that our bodies need to have enough ______ to be healthy. Children should sleep for ten hours every night. Those who do not have enough sleep ______ do their work very well. They will not be clever and they may not get wealthy in the future. Our ______ need exercise as well.

Walking, running, jumping, ______ bikes and playing games are all exercise. Exercise helps us keep fit and become ______. It also helps the blood (血液) to ______ around better. Some scientists (科学家) say doing ______ helps people think more quickly. If you think more quickly, you are cleverer.