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