1. Clouds of toxic ____ escaped in a huge chemical factory blaze.2. The machine ____ a high-pitched sound when you press the button.3. Radioactive waste has been found at the ____.4. Gas is the only ____ without environmental problems.5. Gladys grows a lot of tomatoes in her ____.6. There is a nuclear power ____ nearby.7. About two percent of fast-food packaging ends up as ____.8. We need to think about ____ sources of energy such as wind and solar power9. As the waste materials ____, they produce methane gas.

Environment

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