X. COMPLETE THE SNTENCES WITH THE CORRECT PREPOSITION. 1. coal will be replaced .... natural gas, wind and solar by 2080. 3. once non-renewable resources are used ..., they are gone forever. 4. what will happen if non-renewable resources run ...? 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