四、短文填空。
final health exercise but habit tired by stomachache advice eat
Everyone may get ill sometimes. For example, we may have a headache, a toothache or a(n) 1. Health is very important for all of us. Then how can we keep 2? Here is some 3.
Firstly, remember that many diseases enter 4 the mouth. Unhealthy food can cause illness, so we should eat clean and safe food. Healthy eating 5 are also very important. Eating too much meat is not good for our health while 6 different kinds of vegetables is helpful. Then we should eat less meat 7 more vegetables.
Secondly, we should have a good rest when we feel 8. As students, we study for a long time at school every day. We'd better go to bed early at night. Sleeping well is good for our health.
Thirdly, it's necessary for us to see a doctor when we are sick. When we have a bad cold, we may have a high fever. It can be bad for our health if we don't treat it in time.
9, we should know the importance of doing sports. As the saying goes, "Life lies in movement." We should 10 every day.
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1. stomachache 2. healthy 3. advice 4. by 5. habits 6. eating 7. but 8. tired 9. Finally 10. exercise

本题结合八年级词汇、语法知识点，根据上下文语境、固定搭配和词性变换规则逐一推导：
1. 空前列举了头痛、牙痛这类病痛类名词，对应备选词里的stomachache（胃痛）属于同类病痛，符合举例生病情况的语境。
2. 固定搭配keep healthy意为“保持健康”，需要将名词health变为形容词healthy。
3. 句中be动词为is，说明空格处是不可数名词，advice（建议）符合句意“这里有一些相关建议”。
4. 此处表达“很多疾病通过口腔进入人体”，介词by可以表示“通过（途径）”，符合用法。
5. 句中be动词是are，说明主语为复数，将habit变为复数habits，healthy eating habits是常用表达，意为“健康的饮食习惯”。
6. 此处和前半句的动名词短语Eating too much meat并列，共同作句子的主语，因此eat要变为动名词eating。
7. 此处语义为“少吃肉、多吃蔬菜”，前后语义存在转折，用连词but符合逻辑。
8. 感官动词feel后接形容词作表语，tired（疲惫的）符合“感到疲惫时要好好休息”的语境。
9. 前文依次用Firstly、Secondly、Thirdly分点论述，此处是最后一点，将形容词final变为副词Finally，放在句首首字母大写，意为“最后”。
10. 情态动词should后接动词原形，exercise（锻炼）符合“我们应该每天运动”的句意。