1. Different kinds of tourism may have different ____ on the environment.
2. These scientists are doing a project on the world's leading ____ organizations
3. We must take steps to protect ____ resources, or we will not survive in the future
4. It is possible to reduce the negative impact on the environment by travelling more____.
5. The teacher is satisfied ____ our presentation on global warming
6. I really like watching documentaries ____ animals, plants and remote places
7. Some teachers use very traditional methods ____ teaching at my school
8. We are surprised ____ the number of tourists who have come to our country this year
9. We had a discussion ____ global warming this morning
10. Are you aware ____ the importance of protecting the environment?