Ex5: Choose the correct words. 1.We should rely much more on limited/expensive/alternative sources of energy. 2. The river provides a limited/plentiful/ polluting supply of clean water to nearby villages-they don't worry about water supply any more. 3. The problem with fossil fuels is that they are non- renewable/renewable / dangerous 4. The public have more concerns about water/ nuclear/solar energy because of waste and accidents. 5. He seems not to run up/ run away /run out of energy, so he can work for hours without stopping. 6. Straberries are plentiful / limited / renewable and cheap in summer. 7. Our harmful/ available/ nuclear natural resources will run out soon. 8. Using green sources of energy can make the air chep / unlimited / clean. 9. Solar energy seems to be limited / unlimited / harmful - we can rely on it for a very long time. 10. The air becomes worse because of polluted/ polluting / pollution gases from that factory. giúp e với hứa cho 5s + ctlhn