Air and water (be) necessary for life.They get (pollute)by harmful human activities like unchecked and uncontrolled disposal of industrial waste and effluents. Since the earth summit of 1992, the awareness of the need to take care of our environment (grow) steadily. If we (take) care of our environment, disasters like the one in Uttarakhand could have been avoided.

1. are
2. polluted
3. is growing
4. take

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are 
polluted 
growing 
take
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