A. Fill in the blanks.1. A fire cannot be lighted if there is no............... .2. The air becomes................as we go ............... .3. Contamination of atmosphere causes.................. pollution.4. ................ impurities are left behind after evaporation.5. ........................water is widely used in injections and medicines.6. .................... travels through air.
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Answer: (1) Air
(2) less as we go higher
(3) air
(4) bad
(5)pure
(6)birds
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