Possessive adjectives

I am a student and this is ____________________ pencil .
She is Mónica and this is ____________________ umbrella .
He is John and this is ____________________ car .
They are Elisa and Marco and this is ____________________ house .
We are brothers and this is ____________________ dog .
You are a mother and this is ____________________ son .
It is a dog and this is ____________________ ball .
You are teachers and these are ____________________ books .