Find and correct the mistakes

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Exercise 9. Find and correct the mistakes.
1. Each person is responsible for they property.
2. Them cats are lovely.
3.
Our's is the third house on the left.
4. Do you know where you books are?
5.
Wow! Where a fantastic car you've got!
6. Which quickly he understands!
7. Whose a handsome man he is!
8. Peter hurts because Billy hit he.