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. This channel allows rainwater to run off. A. keep inside ​B. move around ​C. flow into ​D. flow out of 4. A large hydroelectric __________was built on the River Danube. A. power ​​B. dam ​C. bank ​D. wall 5. Water can be held on the land by vegetation. A. plants used as food ​B. grown trees​ ​C. the growth of plants ​D. plants and trees 6. _________air makes people unpleasant to breathe. A. Pollute ​B. Pollution. ​C. Polluted ​D. Polluting 7. The new laws to conserve wildlife in the area will come into force next month. A. protect ​B. pollute ​C. destroy ​​D. eliminate 8. Water pollution is more and more serious due to the tests of nuclear weapon in the seas and oceans. A. circulation ​B. environment ​C. elimination ​​D. contamination 9. Without plants, most water would run off as soon as it falls, taking away valuable soil. A. supplying ​B. recovering ​C. removing ​​D. holding 10. Man is doing harm ___________ the environment. A. on ​B. in ​C. for ​​D. to 11. Fire is the greatest danger _______________ forests. A. on ​B. of ​C. to ​​D. in 12. Dolphins are _______ danger due to serious hunting. A. at​ ​​B. with​ ​​C. in​​​D. on