1. How often does Minh brushes his teeth ?
2. When does Nga go to see the dentist ?
3. Who is will check your teeth ?
4. Where is my brother is going to ?
5. What Mr. Cuong did at 5.30 yesterday ?
6. Who's Hoa received letter five days ago ?
7. How many students in Lien's class having toothache ?
Mình là lớp 5 đó. Chơi lớp 7 vẫn giải dc