1) The students were doing some exercises ________ the bell rang. a) while b) when 2) I saw an accident __________ I was waiting at the bus stop. a) when b) while 3) ______ she was writing an email, her computer went off. a) while b) when 4) He fell down _________ he was climbing a tree. a) when b) while 5) ______ my mom came, my sister was sleeping a) when b) while 6) We found some old photographs _______ we were cleaning our room. a) while b) when 7) _______ you called me last night, I was studying for the test. a) while b) when 8) I had a bad dream _______ I was sleeping on the sofa. a) while b) when 9) ______ the fire alarm went off, we were listening to music. a) when b) while 10) I was taking a shower ______ my dog started to bark. a) while b) when

WHEN OR WHILE

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