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) while b) when 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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