Нужна помощь с английским языком! Заранее спасибо!!!

1. Whose test is this? - It's hers.
2. Whose textbook is this? - It's Steven's.
3. Whose jeans are they? - They're Ted's.
4. Whose shoes are they? - They're ours.
5. Whose puppies are they? - They're his.
6. Whose invitation letters are these? - They're theirs.
7. Whose ticket is this? - It's yours.
8. Whose computer is this? - It's hers.
9. Whose bikes are they? - They're ours.