Chia dạng đúng của từ trong ngoặc

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)