The baby ____(sleep) ____ the door bell ____(ring)., was sleeping ... while ... rang, was sleeping ... when ... rang, was sleeping ... while ... was ringing, slept ... when ... was ringing, My father ____(cook) dinner ____ my mother ____(set) the table., was cooking ... while ... set, was cooking ... when ... set, was cooking ... while ... was setting, cooked ... when ... was setting, The students ____(listen) to the teacher ____ someone ____(knock) on the door., was listening ... when ... knocked, were listening ... when ... knocked, was listening ... while ... was knocking, were listening ... while ... was knocking, I ____(wait) for the bus ____ I ____(see) an old friend., was waiting ... when ... was seeing, was waiting ... while ... was saw, was waiting ... when ... saw, was waiting ... while ... was seeing.

whlie/ when

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