It is no use _________ to persuade him ________ smoking because he has been addicted to it since he wasyoung.
It is illegal for a public official (政府官员) to ask people for gifts or money_____ favors(恩惠,帮助) to them.
The living room is clean and tidy, with a dining table already_____ for a meal to be cooked.
Tom asked the candy makers (糖果制造商) if they could make the chocolate easier____ into small pieces.
Scientists are convinced______ the positive effect of laughter______ physical and mental health.
The prize will go to the writer______ story shows the most imagination.