1. We will clean up the beach ______ the sun rises tomorrow morning., when, when will, will when, when is, 2. ______ I was picking up plastic bottles, I found a dead bird., Because, While, Until, Since, 3. Please don't throw trash in the river ______ you want to kill fish., if, after, unless, while, 4. Turn off all the lights ______ you leave the empty classroom., while, during, until, before, 5. The forest animals will die ______ we stop cutting down trees., if, while, during, unless, 6. I ______ solar panels after I save enough money next year., buy, will buy, am buying, bought, 7. ______ the factory was polluting the river, all the fish died slowly., Until, Before, After, While, 8. We must protect endangered species ______ it is too late to save them., after, when, before, while, 9. ______ you see someone littering, tell them to stop immediately., While, When, During, Until, 10. The pollution will get worse ______ the government takes action soon., if, unless, while, when, 11. Don't use plastic bags ______ you go shopping at the supermarket., when will, will when, when are, when, 12. ______ we were planting trees yesterday, it started raining heavily., Because, Until, While, After, 13. I will recycle these bottles ______ I finish drinking the water., before, after, while, during, 14. The marine animals suffer ______ people throw plastic into the ocean., while, until, during, when, 15. ______ spring comes, we will organize a community clean-up day., When, When will, Will when, When is, 16. She always brings her own bag ______ she goes to the market., wherever, however, whenever, whatever, 17. The pandas had disappeared ______ the rescue team arrived at the forest., after, while, by the time, during, 18. ______ you finish eating, put the waste in the correct bin., While, During, Until, After, 19. We ______ stop using renewable energy until the oil problem is solved., don't, won't, aren't, haven't, 20. ______ I see plastic on the beach, I always pick it up., However, Whatever, Whenever, Wherever, 21. The ice caps will melt ______ the Earth's temperature keeps rising., unless, if, while, until, 22. Please water the plants ______ I am away next week., while will, will while, while am, while, 23. ______ the sun shines tomorrow, we will install solar panels., If, If will, Will if, If is, 24. Don't cut down trees ______ you want birds to have homes., if, unless, while, when, 25. I had already recycled the bottles ______ you asked me yesterday., after, while, during, before, 26. The river will be clean again ______ we stop throwing trash., before, until, after, while, 27. ______ protecting the environment, we must educate young children first., After, While, When, Before, 28. Turn off the tap ______ you are brushing your teeth., while, while are, are while, while will, 29. We will save more energy ______ everyone turns off unused lights., unless, while, until, if, 30. ______ she had planted 100 trees, she received an environmental award., After, Before, While, During

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