... conservationist(n), conservative(adj), conserve(v): sự bảo tồn, chủ nghĩa bảo tồn , người bảo tồn, sự bảo tồn,4. erode(v), erosion(n): xói mòn, sự xói mòn5. reconstruct (v) , reconstruction(n), ... polluted(adj) , pollution(n), 10. deep(adj) depth(n)11. mystery (n) , mysterious(adj)12. contribute( v) , contribution(n)13. exist(v) , existence (n)14. investigate (v), investigation(n)Sau a, an ... hydroelectricity station.( conserve)12. conservation is the safeguarding of …………………… resources (nature)13. Air is ………………by the smoke from the cars and smoke in industry.(pollute)14. Our environment is...