Rain is our main source (a) ______________ water. It rains when the water vapour in the air condenses. Therefore, rainwater is free (b) ______________ germs and soluble solid impurities. However, it contains dust particles. It also contains some dissolved gases present in (c) ______________ air. In places (d) ______________ where the air is polluted, it may also contain harmful substances such as acids. Hence, it is very important to keep our environment (e) ______________ clean as possible.
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ans (a)- fresh,(b) of,(c) the ,(d)_ ,(e) as
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