IV.
1. It takes me 4 hours to do my homework every day.
2. Nam has a toothache because he eats a lot of cakes.
3. She was absent from class because she had a headache.
4. How often do you brush your teeth?
5. After the dentist fixed my tooth, I felt a lot better.
V.
1. What's the matter with you?
2. What's wrong with you?
3. What's the matter with Lan?
4. What's the matter with you, Mai?
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