sentences:  He then bequeathed it on to his son Ma Hongkui.The opium trade thrived in Suiyuan province during the Republican era in China.Opium (poppy) farming was already thriving in Suiyuan by the time Ma Fuxiang became the military governor in 1921, due to the fact that soldiers were not being paid their salaries at all, so they resorted to dealing with opium farmers to make money.