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 e-mail, her computer turned off. a) When b) While 4) __ my mum came home, my sister was sleeping. a) When b) While 5) He fell down __ he was climbing a tree. 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) She started to cry __ she was watching a movie. a) when b) while 10) __ the fire alarm went off, we were listening to music. a) When b) While

When VS while

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