Every pupil has his own potential so it is not proper to _____them ____two kinds．

Nobody knows why the boy can tell what’s written on the paper in another room without looking at it. It really _______ explanation.

The law says that all public buildings must be accessible to people who have trouble _____.

They no longer have to ______ large numbers of temporary workers to do the harvesting.

Mr. Norman has raised some interesting points, but there’s one thing he has completely failed to ____________________.