1. 他致力于帮助穷人。
2. 他一生都献给了造福人类的事业。
He _______ _______ ___ ________ the poor. He ____ ________ ___ _______ the poor.
He _______ ____ ______ ____ ____ benefiting mankind.
devoted himself to helping
was devoted to helping
devote oneself to (doing) sth. 常变为 be devoted to (doing) sth.
devoted his whole life to