I (was walking / walked) to work when I (saw / was seeing) an old friend., While she (was studying / studied), her brother (left / was leaving) the house., They (were having / had) dinner when the lights (went / were going) out., While we (watched / were watching) a movie, someone (knocked / was knocking) on the door., He (was driving / drove) home when he (had / was having) an accident..

CORRECT OPTION

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