The key answer of exercise 1

a)

1. hasn't been
2. 've had
3. have you lived
4. 's worked
5. haven't heard
6. 've had

b)

1. How long have you had your dog?
2. Gill's hated spiders since she was a child.
3. How long has your brother been an actor?
4. We've been married for ten years, and we're very happy.
5. My cousin's been in the USA since February.
6. He's had the same job for eight years.
7. I've had this bike for a long time.

c)

1. 've known each other for
2. 've only had him since
3. hasn't rained for
4. 've been together for
5. hasn't been on holiday for
6. 've lived here since
7. haven't eaten anything since
8. 's played in the band for