II/

28. B

29. D

30. A

31. B

32. C

33. C

III/

34. It is going to rain, however, Peter and Phong are happy to join the procession.

35. Nick wanted to travel around Viet Nam to take picture of festivals, therefore, he started to save money.

36. You can go to Giong festival, otherwise you can go to Huong Pagoda festival.

37. At the Ooc om bok we float beautiful paper lanterns on the river; moreover, we hold thrilling dragon boat races.

IV/

1. Vietnamese students have to wear uniforms when they go to school.

2. You mustn't use your mobile phone on the plane.

3. I like Vu Lan festival best. Because it's an occasion for me to show the respect to my parents.