нести ответственность за(A principal is responsible for an unlawful act of his agent where the act is committed by the agent for the purpose of accomplishing the mission entrusted to him by his principal.)
заниматься(Terry Shaffer got a bottom-tier job as a laborer with the Sullivan County Highway Department where he was responsible for flagging traffic4uzhoj)
нести главную ответственность(Macmillan Dictionary: if you have something such as ultimate power or responsibility, you have more power or responsibility than anyone else capricolya)