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I/

1.  A: What’s the matter?
     B: I have flu.
     A: Poor you! You should be at school. You should stay at home.
2.  A: What’s the matter?
     B:I have an earache.
     A: Poor you! You should go to the doctor. You shouldn’t wait for it to be better.
3.  A: What’s the matter?
     B: I have a stomachache.
     A: Poor you! You should lie down. You shouldn’t eat anything.
4.  A: What’s the matter?
     B: I have a headache.
     A: Poor you! You shouldn’t read any books. You should take a painkiller.
5.  A: What’s the matter?
     B: I have a sore throat.
     A: Poor you! You should take some medicine. You shouldn’t eat any crisps.

II/
1. We should keep our bodies warm to avoid getting flu and having a cold.
2. Getting enough rest helps you concentrate at school.
3. Vitamins play an important role in our diet.

4. You shouldn't play more computer games in free time.
5. The doctor was asking Mai somes question about health problems.
III/
1. Laughing is good for health.
2. Some people have a very bad habit of littering in public.
3. People who live in a dusty area often suffer from diseases.
4. To prevent flu, we should keep our hands clean, our feet warm.
5. She had a sore throat yesterday.

IV/

There are many ways to keep a healthy life. One of the most important way is to do exercise regularly. People have to spend at least 10 minutes a day walking, swimming or doing some household chores. People will feel fresher if they maintain this habit. Another way is to keep eating healthy. People should avoid eating junk food and fast food because they contain too much fatty acid, which are unhealthy. People should eat more vegetables and fruits because they are nutrient. Moreover, people avoid skipping meals because this can cause stomach pain and drink more water. An additional way is to manage the mental health. People should spend more time chatting with friends and their family. They should share bad things with their friends or family so that stress can be prevented.