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Here are the correct answers: 31. C. center 32. B. also 33. B. their 34. B. where 35. A. city 36. Ba Be Lake is the largest lake in Viet Nam. 37. It is in a mountainous area, nearly 250 km from Ha Noi. 38. We can visit the small village "Pac Ngoi" of Tay Minority by a 16-kilometer drive through Ba Be National Park from the entrance. 39. During the boat trip on Ba Be Lake, we can visit some caves and the Dau Dang Waterfall. 40. We can watch the local communities with their daily life.