In each of the following questions, three sentences are given with an bold phrase or words. Choose the single phrasal verb from the options that can grammatically and contextually replace all of the bold phrases or words across all three sentences without changing their core logical meaning. If the sentences are correct as they stand, choose "No improvement required". 1.      The military junta managed to stifle the student-led pro-democracy rebellion before it could gain momentum in the capital city. 2.      ​It is highly recommended to dilute the concentrated chemical solution with distilled water before attempting to clean the sensitive laboratory equipment. 3.      ​To suppress his escalating anxiety before delivering the keynote address, the executive forced himself to swallow his raw emotions.