Supply the correct form of the word in bracket: 35. are working to improve the quality of our lakes and rivers. (environment) 36. As a student she lived very , rarely going out and buying very few clothes. (economy) 37. She is a hearty _ _______________________ in the town. (act) 38. We do not know exactly what the pollutants in the rivers are. They are still . (identify) 39. Environmental pollution has led to the of many species of plants and animals from our planet. (appear) 40. She was very pleased because she performed _____ at the dance (succeed) 41. Red _______the victory, so many people like it very much. (symbol) 42. My friend will get angry if you with his idea. (agreement)