III,

1. helpful 

2. herself

3. carefully

4. toothache

5. was/ were (là 1 trong 2 nhưng mình ko chắc)

6. regularly

7. worrying

8. different

9. serious

10. sensibly

V,

1. How often do you brush your teeth ?

2. He has a small cavity in his tooth.

3. He is scared of seeing the dentist.

4. I am happy to hear you are fine.

5. I wash my clothes and iron them carefully.

6. Hanh ironed clothes for her parents yesterday.

7. The dentist reminds him to brush his teeth regularly.

8. Hoa's parents will visit her after the harvest.

9. Minh is happy because his teeth are OK.

10. Don't eat too much candy or stay up late.

VI, 

1. Don't forget to iron your own clothes.

2. What's the matter with her ?

3. He doesn't like the sound of the drill at the dentist.

4. Doing morning exercises is good.

5. Tuan didn't go to bed late last night.

6. My sister is calm about the E test. (mình không chắc)

7. Try not to forget what you study today.

8. He doesn't hurt (mình không chắc)

9. It's important to brush your teeth.

10. They don't let the farmers be free (không chắc)

_ Chúc bạn học tốt  !