Possessive 'S vs S'

That car belongs to my friend. = It's my ___ car.

• friend's

• friends'

That's the house where my friends live. = It's my ___ house.

• friend's

• friends'

That dog belongs to the family next door. = It's my ___ dog.

• neighbour's

• neighbours'

I need my brother to help me. = I ask for my ___ help.

• brother's

• brothers'

Our daughter goes to a school just for girls. = She goes to a ___ school.

• girl's

• girls'

What does your teacher think about your progress? = What's your ___ opinion?

• teacher's

• teachers'

Our cat always sleeps on that chair. = It's the ___ chair.

• cat's

• cats'

The party was organised by the Smith family. = It was the ___ party.

• Smith's

• Smiths'