Fill in the past perfect OR past simple forms of the verbs.
1. When I ___ (
arrive) at the station, the train ___ (
already,
leave).
2. We ___ (thank) the couple for everything they ___ (do) to help save our daughter.
3. As soon as I ___ (hear) the voice, I ___(realise) I ___ (meet) the person before.
4. I ___ (go) to the shop to buy the shirt I ___ (see) the day before.
5. I ___ (return) the book when I ___ (finish) reading it.