What are the responses for the dialogue task?

1. I didn't laugh at his joke. - Why? Had you heard it before? 2. Were you surprised by the ending of the film? - No, I'd read the book, so I already knew the story. 3. I went to the airport, but I couldn't get on the plane. - Why? Had you left your passport at home? 4. I was homesick the whole time I was living in France. - That's really sad! Had you never lived abroad before? 5. The hotel where we stayed on holiday was awful. - That's a pity. Hadn't you stayed there before? 6. I met my girlfriend's parents for the first time last Sunday. - Really? I thought you'd met them before. 7. My grandfather had two sons from his first marriage. - Really? I didn't know he'd been married before.