Choose the best answer to complete the sentences. 1. If everyone ___________ fossil fuels, they will quickly run out. A. protects B. wastes C. consumes D. saves 2. Solar energy is the cleanest and most ___________ energy source. A. polluting B. non-renewable C. abundant D. inexhaustible 3. Because fossil fuel resources become less _______, they will become more expensive. A. plentiful B. helpful C. useful D. harmful 4. Hydro power is the most efficient way to ________ electricity in many countries. A. create B. save C. generate D. turn 5. A carbon __________ is the amount of greenhouse gas released into the atmosphere by a human activity. A. footprint B. dioxic C. paper D. cycle 6. Natural gas can be used for traffic, and it's ___________ at gas stations. A. exhaustible B. plentiful C. useful D. available 7. Instead of using electricity to make wind - like a fan - wind turbines use _____ to make electricity. A. oil B. solar C. wind D. water 8. Do your parents ___________ coal as well as wood to make a fire for cooking? A. burn B. heat C. reserve D. produce 9. We will cut down on the use of natural gas because it is _______ and harmful to the environment A. plenty B. limited C. available D. abundant 10. Low energy light bulbs should be used to _______ electricity. A. spend B. buy C. convert D. save