1. Visitors, especially children, can go to Cuc Phuong National Park to learn how to recognize the ---------species of animals and plants.

A. differ​​B. difference​​C. different​D. differently

2. This national park is _____ because it has plants and animals from both tropical and temperate zones.

A. specially B. special B. specialize D. specialization

3. The giant panda is in danger of becoming extinct. It is an -------species.

A. dangerous​​B. dangerously C. endanger ​D. endangered

4. Trees, grasses, and other plant life play an important part in the _______ circulation of water.

A. natural ​​B. nature​​C. naturally​​D. naturalize

5. Without plants, most water would run off as soon as it falls, taking away ______ soil.

A. value​​B. valuable​​C. valuably​​D. values

6.The earth is being threatened and the future looks _______.

A. bad​​​B. badly​​​C. badness​​D. worsen

7. Man is _______ doing harm to the environment.

A. constancy​​B. constant​​C. constantly​​D. constants​

8. A campfire near a heap of leaves may _____ cause a forest fire.

A. ease​​​B. easy​​​C. easily​​D. eases