1. These rivers are ………… by the wastes from the industrial factories. (pollute)

2. Many unknown plants and animals are ………… as the tropical forest are destroyed. (appear)

3. My sister is an expert on wildlife and its ………….. (conserve)

4. Green organizations are trying to save rain forests that have been ………….. by developers and farmers. (threat)

5. My uncle is the director of the ………….. organization and charity Greenpeace. (environment)

6. What do you often do for …………… ? (recreate)

7. Many factories are discharging chemical ……………. Into our environment. (pollution)

8. We shouldn’t use too many ………….. for farming. (fertilize)

9. Scientists have made lists of …………….. species. (danger)

10. Do you know what the serious consequences of people’s …………… with the environment are? (interfere)

11. many people are very concerned about the …………. of the rainforests. (destroy)

12. Many species of plants and animals are in danger of ……….. (extinct)

13. The search was called off for the sailor who …………. in the storm. (appear)

14. The health of our children is being ………… by exhaust fumes. (danger)

15. The magazine offers tips on cutting your house ………….. costs.(maintain)

16. His only chance of ………………… was a heart transplant. (survive)

17. He does not believe that modern medicine can …………. with faith-healing. (exist)

18. Plant ………….. is most noticeable in spring and early summer. (grow)

19. His parents tried to …………… him from being an actor. (courage)

20. It is their ……………. to ensure that the rules are enforced. (responsible