21. When are they going to visit Ha Long Bay?
22. Who usually give students a lot of exercises?
23. Why is he punished?
24. What time does he usually go to the field every morning?
25. Who will come to the concert?
26. Who did you meet at the airport yesterday?
27. What is the weather like in the South of Viet Nam?
28. Where and when was the first World Cup held?