Решение:
- This stereo is Mike's. The CDs are his, too.
- We usually go on holidays with ours.
- My aunt collects hats - these two are hers.
- Mary hasn't got a bike - this bike isn't hers, it's mine.
- This book is mine, don't touch it!
- Our neighbours travel a lot - these backpacks are theirs.
Ответ: his, ours, hers, hers, mine, mine, theirs.