1. We decided not to go out for meal _________ we were too tired 2. My shoes are dirty. I'd better take them ________before I come in. 3. Who is going to __________ your children when you're at work? 4. Mary's eyes are weak, __________, she has to wear glasses. 5. Our energy will soon come to an end if we don't__________ it. 6. I like bananas, __________my brother doesn't. 7. Can you turn................ the light? It's too dark. 8. There are............ saving methods and inventions to use solar energy. 9. A new air-conditioner will be................... this morning. 10. Scientists are looking for an..................... way to reduce energy consumption. 11. She won't take all these suitcases______ she likes to travel light. 12. She is very tired. ______, she has to finish her homework. 13. Is he an actor ______ singer? 14. She forgot ______ off the gas before going out. 15. I suggest ______ money for the poor people in our neighborhood. 16. We decided not to go out for meal ______ we were too tired. 17. My shoes are dirty. I'd better take them ______ I come in. 18. Lan dropped his watch when he was............... the bus. 19. I think we should ________ up our neighborhood. 20. Our teacher suggests ________a meeting to discuss about the solution to keep