Put the verbs in brackets into the correct form of the past perfect.
1. When we returned, we found that somebody .............. (broke into) our flat.
2. I ..................... (not/finish) cooking dinner when my parents came to visit.
3. Jim went out for coffee after he ............. (write) a letter to his grandmother.
4. They left the cinema after the film ............. (end)
5. She was excited because she .............. (not/see) a play before.
6. ............. (the kids/go) to bed by the time you got home?
7. He ............. (hear) the song on the radio before he bought the CD.
8. Fiona ............... (plan) to go camping but she ended up staying home.
9. She was sad because she ............. (lose) the game.
10. The match .............. (already/start) when they arrived at the stadium.