Choose the correct verb form in each sentence.

1 David found it hard to concentrate because he didn't meditate / hadn't meditated before.
2 When I got home after jogging, I realised I had lost / lost my door key.
3 The woman hadn't eaten / didn't eat vegan food before, so she was pleasantly surprised by how tasty it was.
4 Theo had already begun to feel stressed by the time he had arrived / arrived at the school.
5 Before Ross had joined / joined the gym, he had spoken to one of the trainers.
6 Eleanor recognised the yoga instructor. Where did she see / had she seen her before?
7 When we got to the village, we discovered that the owners of the spa hotel sold / had sold it. Now it was a large burger bar.
8 After the two women finished the marathon, they went / had gone for a pizza.