7. If the factory continues dumping poisons into the lake, all the fish and other _________ animals will die.

    A. aquatics      B. aquatic      C. aquatical     D. aquatically

8. He is _________ a lot because it is cold.

    A. sneezes     B. sneeze      C. sneezed        D. sneezing

9. Don’t drink that water! It’s __________.

A. contaminated      B. contamination      C. contaminant                D. contaminating

10. A huge amount of _________ chemical waste is dumped into the lake.

    A. poison     B. poisoning       C. poisonous         D. poisons

11. The crop was severely ________ by the acid rain.

  A. damaged      B. poisoned     C. polluted     D. contaminated

12. Many people _________ litter on the streets.

    A. pay            B. give                  C. catch                 D. throw

13. When _________ pollution happens, the water temperature in streams, rivers and lakes, or oceans changes.

    A. water         B. thermal             C. temperature      D. heat

14. The sight of too many telephones poles, advertising billboards, overhead power lines, or shop signs may cause _______.

A. light pollution     B. air pollution    C. visual pollution  D. sight pollution

15. Many children around the world are suffering from birth defects because their parents are _________ to radiation.

    A. worked       B. exposed     C. expressed        D. supposed