2a.
these are; their; is; is; are; have got; eyes; swimmer; very well; cousins' ; their; has got; on; our
2b
1. Yes, they are brothers
2. No, they have short red hair
3. No. Harry is eight
4. Yes, Bob is a very good swimmer
5. Yes, because she is a singer
6. No, their dad is a writer
7. Yes, they have got bikes