1) The students were doing an exercise ______ the bell rang. a) when b) while 2) I saw an accident ______ I was waiting at the bus stop. a) when b) while 3) ______ she was writing an email, her computer turned off. a) when b) while 4) He fell down ______ he was climbing a tree. a) when b) while 5) ______ my mom came home, my sister was sleeping. a) When b) While 6) We found some old photographs ______ we were tidying our room. a) when b) while 7) ______ you called me last night, I was studying for the test. a) When b) While 8) I had a bad dream ______ I was sleeping on the sofa. a) when b) while 9) ______ the fire alarm went off, we were listening to music. a) When b) While 10) She started to cry ______ she was watching a movie. a) when b) while

When or while?

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