Answers

2016-01-20T23:24:01+05:30
Simple......Electricity waste only.
Many students not follow the rules and regulation in the school.
somes student don't think what problem cause by this.
so, when they out from the class is before switch off all equipments work by electricity. 
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2016-01-21T17:36:59+05:30
There will be lot of electricity waste and if we need more electricity we get it from water and water will also be polluted.
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