HELP TUI PLSSS XI. Complete the sentences with the correct preposition. 1. Coat will be replaced.............natural gas, wind and solar by 2080. 2. Fossil fuels, including oil, coal and natural gas, are harmful…..........to the environment. 5. Sulphur dioxide has a direct effect…………healthy and the environment? 6. We are looking……………cheap, clean and effective sources of energy. 7. Vietnam still relies mostly………………non –renewable energy sources. 8. Sunlight is converted……………electricity by each solar cell in the panels. 9. Turning ……………lights saves energy and it also saves money. 10. In developing countries, biogas is mostly used……......cooking, heating and lighting