While I ___ (cook) dinner, the phone rang., was cooking, cook, cooks, cooked, She ___ (swim) in the lake when it started to rain, was swimming, swimming, swim, swam, He ___ (break) his leg while skiing last winter., broke, broken, breaking, breaked, They ___ (fly) to Cairo two days ago, flying, flown, flew, flied, I ___ (drive) home when I saw the accident., drive, drove, driven, was driving, We ___ (choose) the blue one, not the red one., chosen, choosing, chose, chosed, She ___ (sleep) when the earthquake happened., sleep, slept, was sleeping, sleeping, He ___ (teach) us grammar for three years., teaching, teached, taught, taughted

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