Giải giúp mình: 1.Ecotourism is a form of travel that seeks to improve environmental , foster cultural respect, and benefit the economic of local communities. (aware - develop) 2. The Mekong Delta is one of the world’s largest and most inland fisheries. (produce) 3. Son Doong Cave has been recognized as the largest cave in the world. (nature) 4. Phong Nha Cave has the longest underground river, the and longest cave, and most beautiful fine sand beaches inside the caves, the most spectacular stalagmites and stalactites. (high - broad) 5. The most typical ecotourism activities are visits and studies in some national parks, activities in the mountain areas, and community-based ecotourism activities in the . areas. (adventure - mountain) 6. consider Phong Nha - Ke Bang to be of particular importance for bird . (research - conserve) 7. The Central Highlands is also highly appreciated thanks to its high diversity. (biology) 8. The Bach Ma area has long been famous for its rich biodiversity, and plant species within Bach Ma National Park is still high. (rich)