WHO CAN STOP HIM __ DOING THIS

WHO CAN STOP HIM __ DOING THIS must doing him we like stop this can't stop doing sth. WHO CAN SAVE HIM? Who can think of a situation __ this idom can be used? i can not stop .can not stop this love who __ this boy and this girl? How can we stop him from smoking. How can we___him___smoking Can you __ __ this math problem? Can you give him a hand (改为同义句）Can you __ him __ __ this is me that/who love him. who can explain this dream?