Choose the correct options to complete the sentences

1. My uncle [had sold|had been selling|sold|was selling] his old car last year.
2. We saw Kevin and Jill at the shopping mall yesterday. They [looked|had looked|had been looking|were looking] for new bike helmets.
3. When Ingrid arrived, everyone [watched|was watching|had watched|had been watching] a film for an hour.
4. Jack knew that his sister was very tired, so he [didn't ask|wasn't asking|hadn't asked|hadn't been asking] her any questions yesterday.
5. It was very difficult for Molly to find the way because she [was never|was never being|had never been|had never been being] there before.
6. While my sister was keeping an eye on my nephew playing at the playground, I [read|was reading|had read|had been reading] a book.
7. Gabriel refused to have dinner with us as he [already ate|had already eaten|was already eating|had already been eating] before we met.
8. Elissa was very worried as she [called|was calling|had been calling|had called] Michael for the whole day but got no reply.