55.2 Choose the right word.

55.2 Choose the right word.

1. Is this your book? (your is right)
2. It's their / theirs problem, not ours. (their and ours are right)
3. Are these yours shoes?
4. Is this camera yours?
5. That's not my umbrella. My is yellow.
6. They know our address but we don't know their / theirs.
7. They've got two children but I don't know their / theirs names.
8. My room is bigger than her / hers, but her / hers is nicer.