Is this yours / your daughter? It's theirs / their problem, not our/ours.
It's a good idea of your / yours to go to the bar tonight.
4. Are these her / hers shoes?
5. We're going swimming with some friends of our/ours.
6. Is it yours / your article about spiders? -No, it's not my / mine.
7. We know their / theirs address but they don't know our / ours.
8. That's not my / mine wallet. Mine / my is black.