Match the parts of sentences in column 'A', 'B' and 'C' to write four complete sentences.

Column A	Column B	Column C
(a) Air is an	(i) no living being	(i) air in many ways
(b) Without alr	(ii) Important element	(ii) to prevent air pollution
(c) But unfortunately,	(iii) should be taken	(iii) can survive
(d) So, steps	(iv) we are polluting	(iv) of our environment