Bob ..................... (run) fast when he slipped and fell.
was running
My friends ................ (relax) on the beach yesterday when it started to rain.
were relaxing
While he ..................... (prepare) dinner, he cut his finger.
was preparing
When I got up this morning, my father .................. (listen) to the radio in the kitchen
was listening
She ......... (break) her leg while she ..................... (ski) in the Alps.
broke / was skiing
Matt ................ (use) the computer when the modem crashed.
was using
I ......... (read) a book when you called me.
was reading