You were washing the dishes ______ I was drying them., when, while, The waiter was carrying the tray ______ he dropped a glass., when, while, Sam was crossing the road ________ he saw his friend at the bus stop., when, while, Lin and Wendy were preparing for the test _______ the postman knocked at the door., when, while, We were discussing the film ______ Mary was looking through some magazines., when, while, The child was eating soup _______ his mother was making salad., when, while, Kate was speaking to the doctor ______ her mobile telephone rang., when, while, He was riding a horse ______ the car drove to the stable., when, while, Sue was walking along the path ______ it started to rain., when, while, I was brushing my teeth ________ my sister was making tea., when, while.

when or while

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