fill in the correct possessive pronoun

1"Whosw is this? is it .......?"
"Yes, it's my pencil."
2This is our house. It is ........ .
3"Are these her muffins?"
"Yes, they are........ ."
4"Is this your bike?"
"No, it's my brother's. It's ......... ."
5 Don't eat the biscuit, it's .......... ."
6 "Whose dirty shoes are these?"
"The are the children's. They are ........ ."