Ex IX: Choose the best answer 1. Emissions from vehicles have negative ………………..on the environment. A. tasks B. effects C. benefits D. problems 2. Using non-renewable energy sources like coal, oil …………………a lot of carbon dioxide. A. makes B. does C. uses D. produces 3. They …………………..solar panels on the roof of the house to catch the energy from the sun. A. have B. get C. install D. put 4. Wind is one type of …………………source of energy. A. renewable B. expensive C. dangerous D. exhaustible 5. What things do they think might ………………..a big carbon footprint? A. take B. put C. carry D. create 6. I think that using biogas is abundant and ……………… A. limited B. polluting C. cheap D. exhaustible 7. Solar energy is plentiful and it can be ………………….easily. A. recycled B. replaced C. reduced D. reused 8. We install solar panels on our roof for the heating and …………..water. A. hot B. cold C. dirty D. clean 9. His brother is ……………cracks in the water pipes. A. having B. checking C. taking D. producing 10. The teacher is ………………..a talk about how to save energy. A. doing B. taking C. giving D. making