I fell asleep while I _______ the film.

The teacher called me back as I _____ the classroom.

The head teacher ____ while we were doing the exam.

As we _____ to the airport, I realised I didn't have my passport.

While you ______ , three people called for you.

She ______ one of her friends while she was taking the dog for a walk.

As we _____, I realised that I'd met her before.

They didn't speak while they _____ their homework.