________ needs further discussion whether we'll build a laboratory or not.
Scientists are convinced ________ the positive effect of laughter _______ physical and mental health.
Each of the students,working hard at his or her lessons, to go to university.
He has devoted all his life ______ the homeless children.
In the end, Japan and Korea reached the point ___ both sides sat down and had a peaceful talk.
The police are offering a(n) ______ for anyone who can give information about the trafficaccident.