1 diversity

2 biodiversity

3 recognized

4 stalactites

5 awareness

6 productive

7 ecotourism

8 conservation

I. Complete the sentences with a suitable word in the box. 

recognized /stalactites /diversity/ biodiversity/ecotourism/ conservation /awareness/ productive
1. The Central Highlands is also highly appreciated thanks to its high biological ___________diversity______________.

2. The Bach Ma area has long been famous for its rich ___________biodiversity_____________ , and plant species richnesswithin Bach Ma National Park is still high. 

3. Son Doong Cave has been __________recognized_________________ as the largest natural cave in the world. 

4. Phong Nha Cave has the longest underground river, the highest and longest cave, broadest and most beautiful fine sand beaches inside the caves, the most spectacular stalagmites and ____________ stalactites______________. 

5. Ecotourism is a form of travel that seeks to improve environmental __________awareness__________________, fostercultural respect, and benefit the economic development of local communities.

 6. The Mekong Delta is one of the world's largest and most __________productive________________ inland fisheries. 

7. The most typical _____________ecotourism_____________ activities are visits and studies in some national parks, adventurous activities in the mountain areas, and community-based ecotourism activities in the mountainous areas. 

8. Researchers consider Phong Nha - Ke Bang to be of particular importance for bird ___________conservation__________