21. Different activities should be carried out to raise the ____ of our people about ecotourism.
A. Knowledge B. thought C. awareness D. understanding
22. Worldwide commercial exploitation of animals for food and other products has seriously ____ the number of endangered species.
A. reduced B. minimized C. demolished D. eliminated
23. There are a number of ____ that should be taken to protect tropical forests.
A. measures B. policies C. methods D. activities
24. Phong Nha - Ke Bang National Park, the absolutely stunning place where the largest cave in the world, Son Doong, is located, is one of the famous tourist ____ in Central Vietnam.
A. attractions B. romances C. sight-seeing D. destinations
25. My husband is always proud of owning ____.
A. so large and productive travel agency B. such a large and productive travel agency
C. what a large and productive travel agency D. how large and productive travel agency
