Answers

2014-06-09T14:43:27+05:30
Lights----to give lightdarkness.
fans-----------produce air to feel cool.
computer----to play games,draw,search informations
1 4 1
2014-06-09T15:00:50+05:30
If we look around we, can see many things, which is very usefull, for us.                
some of them are
 light- which help us to see from darkness
 T.V- for an entirtanment  
fans- which cools from steaming hot etc.......
and also all sources like : fridge, computer, ...........etc .
2 3 2