1. wrong
2. headache
3. feel
4. take
5. would
6. slight
7. cough
8. common
9. disappear
10. symptoms
IV
1. You had better brush your teeth at least twice a day.
2. Linh had better not stay up late.
3. You had better do morning exercise regularly.
4. She had better take some aspirin.
5. You had better not make such a noise in hospital.