He …… (not remember) where he …… (put) his keys.
didn't remember, had put
They …… (finish) their homework before the movie …… (start).
finished, had started
By the time I …… (get) to the party, everyone …… (go) home.
got, had gone
By the time the police …… (arrive), the thieves …… (already/escape).
arrived, had already escaped
We …… (be) hungry because we …… (not eat) anything all day.
were, hadn't eaten
When we …… (arrive) at the station, the train …… (already / leave).
arrived, had already left
She …… (be) tired because she …… (not sleep) well the night before.
was, hadn't slept
The teacher …… (be) angry because we …… (not do) our project.
was, hadn't done
I …… (think) I …… (meet) him somewhere before.
thought, had met