1. The teacher is going to talk about common health and give advice. (problems/issues/illness)
2. To avoid having a toothache, we should brush our teeth twice a (week/month/day)
3. To avoid having a cold, you should keep warm by wearing a in the winter. (blanket/hat/scarf)
4. To avoid having a sore throat, we shouldn't (eat ice cream/drink warm water/keep warm)
5. To avoid having a stomachache, we should eat food. (healthy/junk/fast)