47. Production of these chemicals causes serious_______pollution A. environment B. environmental C. environmentally D. environmetalist 48. My friend said he really enjoyed doing_______experiments and finding out how things worked A. science C. scientist D. scientific B. scientism 49. Mary and Tom are getting married in July -_____________ A. How wonderful B. That's a relief C. That's awful D. Oh no! 50.Hoa told me that_____ our new teacher of English. A. she wants to become B. she wanted to become C. she will become D. she wanted becoming