While he ............, his father arrived, slept, was sleeping, ..............She was cooking ,her friend called., While, When, When I .......... him , he was playing. , saw, was, What were you doing when I ....................you?, calling, called, They were watching TV , when the lights .............. off, switched , switching, While I ................ my car, I crashed into a tree, drive, was driving.

while- when

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