题目内容：

根据短文内容及所给提示，在文中的空白处填写一个正确的单词。

Health is very important. As we all know, people want to keep 1.(health). But how can we do that? Here are some 2.(way) to keep in good health. I think we should eat more vegetables 3. fruits. Because there are a lot of vitamins in them. We shouldn't eat butter, cheese, chocolate or drink coffee. Because they 4. a lot of sugar and fat. They are 5. (harm) to you. It can make you become fatter and 6.(fat). In a word, we'd better have a 7.(balance) diet. We also need to take exercise every day and have 8.good rest, so that we can keep fit. By the way, we shouldn't stay up too 9. and we'd better not10.(smoke). In this way, I'm sure that we can become very strong.