1. book (he) - It's his book.
2. apples (we) - They're our apples.
3. family (we) - It's our family.
4. sister (you) - She is your sister.
5. grandfather (she) - He's her grandfather.
6. cars (he) - They are his cars.
7. garden (they) - It's their garden.
8. toys (it) - These are its toys. (его игрушки; собачкины, например)
9. computer (I) - It's my computer.
10. friends (we) - They are our friends.