1. Some people have a very annoying habit of stuttering in public.

2. People who live in dusty areas often suffer from diseases.

3. Julia has a headache, and she feels dizzy.

4. I have an allergy, so I choose food and drink very carefully.

5. You should spend less time playing computer games, or your eyes will be strained.

6. Tom feels tired, but he doesn't go to bed early.

7. Trung eats too many sweets so he has a terrible toothache.

8. To prevent the flu, we should keep our hands clean and our feet warm.

9. Fresh vegetables promote health.

10. Tom is fat because he eats too much and doesn't get enough exercise.

Exercise 8:

1. Do more exercise if you want to lose weight.

2. I have a lot of homework to do this evening, so I don't have time to watch the football match.

3. Eat more vegetables, and you will feel healthier.

4. Take up a new hobby, and you'll have some new friends.

5. Eat more fish, and you will be smarter.

6. He has toothache, but he still eats a lot of sweets and cakes.

7. Try to talk less if you have a sore throat.

8. Smoke less or give it up.

9. Sunbathe less, or you'll get sunburnt.

10. If you spend less time on computer games or television programmes, you will have more time for outdoor activities.