Our guests arrived while we _____(watch) TV.
were watching
I ______(study) English while my mother ______(prepare) lunch.
was studying/was preparing
The thieves____(break into)houses for two years before they were finally caught.
had been breaking into
He went to the office and ______(clean) everything.
cleaned
Kevin______(wait) to buy a ticket for the train when he heard a strange noise.
was waiting
I _______(complete) my studies by 2011.
had completed
I ______(walk) when I _____(see) my friend.
was walking/saw
At this time yesterday, I _____(write) an essay
was writing
I _______(make) a cup of tea when I ______(remember) that I ______(not buy) any.
was making/remembered/hadn't bought
I ____(wake up) late, so I ____(miss) the bus.
woke up/missed
She _____(wear) the shoes that she _____(buy) the day before.
wore-was wearing/had bought
I couldn't open the door because I ______(lose) my keys
had lost
As soon as the film started I realized that I ____(see) the film before.
had seen
He ______(make) a fortune before he started the company
had made
When the children _____(arrive)home, it was obvious that they had been playing in mud.
arrived
All last year, the company ______(look) for ways to survive.
was looking
When I was a student, I ____(not have) much money.
didn't have
They________(leave) many hours before we arrived.
had left
Sorry, I _____(drive) when you called.
was driving