1. Minh brushes his teeth (twice a day.)

→ How often does Minh brush his teeth?

2. Simon is in a lot of pain now (because he has a toothache.)

→Why is Simon in a lot of pain now?

3. I felt (sick) after eating that food.

How did you feel after eating that food?

4. Nga went to see the dentist (last week.)

When did Nga go to see the dentist?

5. (Dr Lai) will check your teeth.

Who will check your teeth?

6. It took Dr Phong (10 minutes) to fill Van’s tooth.

How long did it take Dr Phong to fill Van's tooth?

7. My brother is going to (the hospital.)

Where is your brother going to?

8. Mr. Cuong (did morning exercises) at 5.30 yesterday.

What did Mr Cuong do at 5.30 yesterday?

9.Hoa received (her aunt’s) letter five days ago.

Whose letter did Hoa receive five days ago?

10. There are (twelve) students in Lien’s class having toothache.

How many students are there in Lien's class having toothache?