The students were doing an exercise ______ the bell rang., when, while, I saw an accident ______ I was waiting at the bus stop., when, while, ______ she was writing an email, her computer turned off., when , while, He fell down ______ he was climbing a tree., when , while, ______ my mom came home, my sister was sleeping., When, While, We found some old photographs ______ we were tidying our room., when, while, ______ you called me last night, I was studying for the test., When, While, I had a bad dream ______ I was sleeping on the sofa., when, while, ______ the fire alarm went off, we were listening to music., When, While, She started to cry ______ she was watching a movie., when, while.

When or while?

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