1. You shouldn't use your car because it (3) causes noise and air pollution.
2. This notice can be seen at the zoo or at the circus to (9) protect people from
danger. 3. He wants to become an ecologist himself to research and protect the
(1) environment. 4. Recently, however, our beach has become more polluted with (10) litter left by tourists and locals. 5. Our forests are disappearing because they are (2) cut down or burnt. 6. Your family can begin trying to (8) save the Earth right now.
7. If you go the seaside, you'll see the (4) pollution around you. 8. If people hadn't invented different machines and developed industry, the (6) environmental problems wouldn't have appeared. 9. Why is litter so (7) dangerous in the countryside? 10. When you buy packed goods, don't drop the (5) packaging.