There cannot be any margin for error as it is a highly responsible task of great national importance that demands time, money and effort.

The activities required to stay active in the program will demand effort largely outside of the classroom.

This demands sincere and sustained effort by the individual.

The group is demanding more effort from those in charge of factories.

The confusing work of the democratic process will demand extensive effort in coming months.

The Rangers' movement up the hill was a physically demanding 2-hour effort under heavy mortar fire and in thin mountain air.

This case demanded lone effort, of the sort that The Shadow could provide.

Success will demand concerted effort and long-term commitment, but the returns should be considerable.

Mr. Friedman said the students were aware that the program would demand time and effort.

Digging a snow cave can be a very physically demanding effort.