10. When was the first opera performed?
11. What can music help?
12. How often do you take a holiday?
13. Where are the concerts usually held?
14. Which kind of music do you like?
15. How long does it take you to go to school?
16. Why did she go out last night?
17. Why did miss Phuong go home early? 
18. What time does Mr. Vy often get up?
19. How long have you learned/learnt English?
35. When did they go to Lan's birthday party?
36. How long does it take him to get ready?
37. How many times a week does your father go to work?
38. He choose a suitable position to put his camera to take the best photographs.
39. She tries to practice jogging everyday in order to loose her weight.
40. Who teaches you English?