17. The campaign against air pollution was organized by a famous _____ activist. (environment) 18. She carries a gun in her bag for personal ____. (protect) 19. Energy ____ is a problem all over the world. (conserve) 20. As it hasn't rained for months, there has been a serious____ of fresh water. (short) 21. Scientists are looking for an ____ way to reduce energy consumption. (effect) 22. I want to see the _____ of environment from the local authority. (protect) 23. Solar energy is ____ by the sun. (provision) 24. What can we do _____ energy? (conservation) 25. Kristen, remember to use energy more ______! (efficient) 26. She was _____ pleased that she passed the exam. (extreme) 27. He is one of the best _____ in the world. (environment) 28. We can ____ the environment by reducing air _____(protection/pollute) 29. It's _____ that he has overcome all difficulties. (wonder) 30. want to see the _____ of environment from the local authority. (protect) 31. Scientists are looking for an ____ way to reduce energy _____ (consume) 32. There have been some __________ in unemployment. (reduce) 33. That lamp uses very little _______. (electric)