atmosphere, fossil, Energy, harmful, conservation, Pollution, exhausted, alternative, chemicals, released 6. People use _____to run machines, heat and cool their homes. 7. Environmentalists say there is a high risk of_____ from the landfill site. 8. _____released from the car factory pollute the water of this river. 9. Oxygen from the water is released into the_____ . 10. These herbicide are environmentally_____. 11. We need to save our natural resourcesly searching for_____ fuels 12. _____fuels will be exhausted within a relatively short time. 13. The government has spent one million dollars on advertising campaign to encourage energy_____ . 14. Fuel supplies are nearly_____ 15. The sun_____ large amounts of energy every day. òm các cậu giúp tui được hem