Find the mistakes :1?

Find the mistakes : 1. I have a friend, haven’t I? 2. His name is Gary, isn’t he ? 3. My friend isn’ t tall, isn’ t he? 4. His eyes are blue, aren’t he ? 5. Last year he was 9, isn’t he ? 6. Now he is 10, isn’t she ? 7. Gary is a schoolboy, is he ? 8. He likes Maths, don’t he ? 9. He doesn‘t like Music, doesn‘t he ? 10. His hobby is camping, isn’ t he? 11. Last year we had a holiday, hadn’t we ? 12. We went camping, did we ? 13 Gary made a fire, doesn’t he ? 14. It was very interesting, didn’t it ? 15. I liked it very much, don’t I ? 16. The last sentence is correct, is it?