The students 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., 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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