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Whose coputer is it?
It is Rob's.
Whose dogs are they?
These are family's.
Whose car is this?
It is James's.
Whose books are these?
There are Mark's.
Whose mobile phone is this?
It is Rosy's.
Whose friends are they?
They are Mark and Rosy's.
Whose horses are they?
These are grandparents's.