III.
1. checked up
2. fixed
3. ate
4. forgot
5. received
6. didn't have
7. doesn't iron
8. spoke
9. polished
10. tidied
IV.
1. How often does Minh brush his teeth?
2. Why does Simon have a lot of pain now?
3. How did you feel after eating that food?
4. What did Nga do last week?
5. Who will check your teeth in a moment?
6. How long did it take Dr.Phong to fill Van's tooth?
7. Where is your brother going to?
8. What did Mr. Cuong do at 5.30 yesterday?
9. When did Hoa receive her aunt's letter?
10. How many students are there in Lien's class have toothache?