By the time he arrived, the movie ... (start)
had already started
She ... for hours before the test. (study)
had been studying
He ... his keys, so he couldn't get into the house. (forget)
had forgotten
They ... around Africa for a month before returning home. (travel)
had been traveling
We ... enough money to buy a new car. (save)
had saved
He ... at the company for ten years when he got promoted. (work)
had been working
She ... her homework before dinner. (finish)
had finished
They ... Paris before their trip last summer. (never/visit)
had never visited
By the time she called, I ... the house for two hours. (clean)
had been cleaning
We ... for the bus for twenty minutes before it finally arrived. (wait)
had been waiting