Possessive pronouns and possessive adjectives

We're going swimming with some friends of our/ours.

That's not my / mine wallet. Mine / my is black.

His cottage is bigger than her / hers.

It's theirs / their problem, not our/ours.

We know their / theirs address but they don't know our / ours.

Is it yours / your article about spiders? -No, it's not my / mine.

Is this yours / your daughter?

My / mine parents live in Vitebsk region, and your / yours?

It's a good idea of your / yours to go to the bar tonight.

Are these her / hers shoes?