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III. Reorder the words to make full sentences.
1. more free time, / I would take part in/ If I had/ the volunteer program./
2. we'll threaten/ our plastic waste, / our own existence./ If we don't reduce/
3. the ozone layer, / from the UV rays?/ what would save us/ If we destroyed/
4. I would use /energy efficient/ If I were you, / light bulbs./
5. happen if/ What would/ water pollution / stopped?/
6. wouldn't be /so polluted/ waste into it./ if factories/ The river/ didn't dump /