Past Simple and Past Continuous

The pupils were doing an exercise _______ the bell rang

• when

• while

I saw an accident _________ I was waiting at the bus stop.

• while

• when

________ she was writing an email, her computer turned off.

• when

• while

He fell down __________ he was climbing a tree.

• while

• when

We found some old photographs ________ we were tidying our room

• when

• while

I had a bad dream _________ I was sleeping on the sofa.

• when

• while

She started to cry _________ she was watching a movie

• while

• when

We were listening to music __________ the fire alarm went off.

• while

• when