1) While he ............, his father arrived a) slept b) was sleeping 2) ..............She was cooking ,her friend called. a) While b) When 3) When I .......... him , he was playing.  a) saw b) was 4) What were you doing when I ....................you? a) calling b) called 5) They were watching TV , when the lights .............. off a) switched b) switching 6) While I ................ my car, I crashed into a tree a) drive b) was driving

while- when

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