1) I was cooking dinner ___________ my sister was doing her homework. a) when b) while 2) The lights went out ___________ I was reading a scary book. a) when b) while 3) They were laughing ___________ they were watching the comedy show. a) when b) while 4) I met my best friend ___________ I was living in London. a) when b) while 5) ___________ we were waiting for the bus, it started to rain. a) when b) while 6) The dog started barking ___________ the mailman arrived at the door. a) when b) while 7) My dad was washing the car ___________ my mom was watering the plants. a) when b) while 8) I was sleeping deeply ___________ the earthquake started. a) when b) while 9) ___________ you were sleeping, I cleaned the entire kitchen. a) when b) while 10) She was crossing the street ___________ she saw the car accident. a) when b) while

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