1. Are these/ Is this your sister's kids ? 2. I've lost my hotel key. Have you got yours / your ? 3. The Smiths are taking so much stuff that theirs/ their suitcases are very heavy. 4. I think it's those woman's / women's tent. but you should ask them to be sure. 5. My aunt invited me to go shoppingg with her / she. 6. This/ These children are so noisy that I can't relax. 7. I need to deal with the customer's / customers' complaint now because he's waiting for a reply.
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