1. Half the world's rain forests have already been . a. endangered b. eroded c. found d. destroyed
2. Try to eliminate fatty foods from your diet.
a. limit b. get rid of c. move d. add
3. Acid rain has caused severe on the hillside.
a. erosion b. pollution c. destruction d. floods
4. This channel allows rainwater to run off.
a. keep inside b. move around c. flow into d. flow out of
5. A large hydroelectric was built on the River Danube.
a. power b. dam c. bank d. wall
6. Water can be held on the land by vegetation.
a. plants and trees b. grown trees c. the growth of plantsd. plants used as food
7. air makes people unpleasant to breathe.
a. Pollute b. Pollution.
c. Polluted d. Polluting