Past Perfect / Past Simple. Choose the correct answer

He ___________ dinner when the phone rang

I saw many people when I _________ the door.

Katy was very sad because she _________ her purse at home.

Last year they went to Brazil. They ________ to this country before.

I wanted to open the window but someone else _______ it.

Who _______ there before you?

Ewa _________ sorry that she _______ such a mistake.

No sooner ____ work than his friend came.

Last week they won the championship. Prior to that time, they _____ the prize.

It ________ the first time Tina _______ the horse.

They __________ in time because they ____________a taxi.

After Sally ____________ all the letters, she ______ them.