III. Fill in each gap with a suitable word beginning with a letter given.
1. N____________ sources of energy include coal, oil and natural gas.
2. We need to look for ways to reduce our carbon f_______________.
3. Coal is a f _____________fuel that was formed millions of years ago.
4. Renewable energy sources will never run out because they are abundant and a_____________.
5. B________________ can be produced by dead plants and animals as they decay.
6. Burning fossil fuels emits a lot of pollutants that are h_____________ to the environment.
7. Solar p_______________ are placed on the roofs of the houses and turn the sun’s ray into energy
8. Some countries are replacing coal with natural gas because natural gas is less p___________ than coal.
9. S_____________energy creates clean, renewable power from the sun.
10. Sunlight can be converted into e_____________ for every house.
1 natural
2 footprint
3 fossil
4 available
5 biofuel
6 harmful
7 panels
8 polluting
9 solar
10 electricity
