Use the past continuous (was/were + verb-ing) for an action that was in progress in the past. Use while for the longer background action, and when for the shorter action that interrupts it.
Examples: I was cooking when the lights went out. · While she was cleaning, she found a leak.
Type the correct verb form in each blank. Use the simple past for the short, finished action and the past progressive (was/were + verb-ing) for the longer action in progress. The verb you need is in parentheses — change it to the correct form.
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