Решение:
- This is (my / mine) book.
- She is (her / his) sister.
- We love (our / ours) house.
- The dog wags (its / her) tail.
- They are (their / theirs) toys.
- Is this (your / yours) bag?
- He likes (his / her) job.
Ответ: my; his; our; its; their; your; his.