1. Why don't we _________ old school objects for candies?
2. Water is used to generate __________.
3. If student recycle and used recycled material, they will save ___________.
4. Let's reduce the __________ of deforestation.
5. They use __________ plastic bottles to keep water.
6. We can find noise pollution _________ most cities.
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Sinh Học lớp 12
