Think of the ways in which you can use each of these things:
(a used paper envelope, an old greeting card, an empty ghee tin)
used paper envelope can be used to store photographs or write some important daily stuff's and paste it somewhere.
Old greeting card can be put up in a public box which are then reselled at festivals to the people who cant afford to buy the new one.
Empty ghee tin Can be used for growing new plants in house or it can be used as a separate dustbin to store small metal waste or cans and then send to recycling store.
Couldn't generate an explanation.
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