Think about where water is not the need and elimonate the options
why do we boil milk?
When your stomach is not well , waht kind of food will be easy to digest for you
How do you clean the water?
Have you seen someone wasting water, if they were not doing that, then too will we be suffering from water shortage?
Think out of the options, and eliminate one by one
Think of why we have more rains in the region of south India
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