The environment plays an important role (a) —----- our life. (b) — short, what we have (c) —----- us including people, houses, air, water etc. is called environment. These are the main elements (d) —----- our environment. (e) —----- ensuring sound life the balance (f) —------ the natural elements is very significant. Sometimes (g) —------- lack of knowledge, we don’t realize the importance (h) —------ it. As a result, we are polluting our environment unknowingly. Living (i) — a polluted environment is undoubtedly a matter (j) — great regret.