Fill in the blanks with the appropriate form of the verb given in brackets: He said that he…

Fill in the blanks with the appropriate form of the verb given in brackets: He said that he ______(9) (hear) the vibrating sound from the track change so drastically that he recognised it was due to the crack in the railway line. The man who _____(10) (save) many lives that night was none other than the best engineer that India has ever produced, Mokshagundam Visvesvaraya or Sir M.Visvesvaraya.