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