1. How often does Minh brush his teeth?
2. Why Simon has a lot of pain now?
3. What did you feel after eating that food?
4. Who was Nga went to see last week?
5. Who will do with your teeth in a moment?
6. How long did it take Dr. Phong to fill Van's tooth?
7. Where does your brother going?
8. What did Mr. Cuong do at 5:30 yesterday?
9. When did Hoa receive her aunt's letter?
10. How many students are in Lien's class having toothache?
11. Where do they play badminton after school?
12. How many English books does Ba have?
