Fill in the blanks with the help of words given in bracket after each sentence.
(a) When air is contaminated by ____ substances which have a ____ effect on both the ____ and ____, it is referred to as ____. (air pollution, harmful, living, unwanted, non-living, pollutants).
(b) Many ____ are responsible for causing ____ pollution. Petroleum ____ are a major source of ____ pollutants like ____ and ____. (sulphur dioxide, refineries, industries, nitrogen dioxide, gaseous, liquid, people, air).
(c) While ____ your teeth, leaving the ____ running may waste several ____ of water. (tap, litres, brushing, washing, drops)
(d) Water which is suitable for _____ is called ____ water. (washing, bathing, drinking, potable, soft).
(e) Water which looks clean still has *** carrying ____ and ____ impurities.(insects, microorganism, particles, dissolved, harmful).
