3 Complete the phrases using: wind, surf, pollution, extinct, studies, run on, research, extreme, clean, download. 1 business ................................ 2 ................................ a topic 3 ................................ power 4 water ................................ 5 ................................ music 6 ................................ the Net 7 ................................ weather 8 ................................ energy 9 animals become ................................ 10 ................................ electricity