Ex. 2 Choose the correct option. 1. I had read / had been reading an interesting book for two hours before my parents' guests visited us. 2. He failed the exam because he hadn't studied / hadn't been studying hard enough. 3. We had struggled / had been struggling to understand professor Hopkin's lecture before we finally gave up. 4. I didn't have to do any housework because my husband had done / had been doing everything. 5. It was the first time he had danced / he had been dancing the waltz. 6. How long had you studied / had you been studying before you fell asleep? 7. When I arrived at the cinema, I realised I had forgotten / had been forgetting my wallet. 8. How long had David lived / had David been living in Manchester before he got a new job in Glasgow? 9. My dog had torn apart / had been tearing apart some important documents before I came back home. 10. I had watched / had been watching television for a few hours before I went to bed.