27. C
28. A
29. B
30. D
31. It is a tourist destination.
32. They can enjoy the beautiful scenery of the Muong Thanh Valley, visit the neighboring villages, and share the hospitality of the local people.
33. They are members of the Thai or H’Mong ethnic minorities.
34. It is only 30 kilometers.
35. Yes, it is.
36. What about going to the movies tonight?
37. He drives car safely.
38. How much is the green dress?
39. Mai's sister is shorter than Mai.
40. What is Nga's height?