Complete the correct answers.
1. a/the
2. a/no article
3. a/the
4. a/no article
5. the/no article
6. the/no article
7. an/no article
8. an/the

Paddy: What are you doing at 1. ___ weekend?
Ellie: I'm going caving. There's 2. ___ great place for it in the mountains near my uncle's house.
Paddy: It's 3. ____ dangerous hobby, isn't it?
Ellie: Not really. My uncle is 4. ___ rock climbing instructor. He says 5. ___ caving is safer than 6. ___ climbing.
Paddy: I'd love to learn how to climb.
Ellie: My uncle could teach you, but he charges £25 7. ___ hour.
Paddy: I can't afford that. But I think there's 8. ___ indoor climbing wall in town. I could practise there.