Choose the correct option

1. Mark has got a new flat. ... flat is spacious. 2. Is Ruth ... sister? 3. This camera isn't ... . 4. This little puppy isn't ... . 5. Tina and Susan are ... friends. 6. What's ... phone number? 7. Is this skateboard ... ? 8. ... house is very modern. 9. Are these books ... ? 10. What is ... address?