---What did the old man say?---Oh, he told us _________ football in the busy street.
We will be for ______ promises to volunteer to help us solve the puzzling problem.
Tim Bemers-Lee is generally considered ______ the World Wide Web, on which all the information is shared by all.
I won’t have you ______ up and down all day.
Every minute is made good ______ of ______ for the coming national examinations.
The question that puzzled us is _____ we can get rid of the air pollution in the area.