To suggest that a volunteer could fill the shoes of a trained professional undermines our educational system.

There were many other opportunities to serve, and volunteers eagerly filled those needs.

The volunteers fill a big void.

The inexpensive bags are easy to transport when empty, and unskilled volunteers can quickly fill them with local sand in emergencies.

If approved, the volunteers often fill in for colleagues until a slot opens.

These volunteers filled the equivalent of more than 33 full-time staff positions.

With cutbacks in public services, volunteers fill gaps at a fraction of a decent living wage (ours gross $756 monthly, or $630 after taxes).

Here, too, volunteers fill in, but the pool of specialized labor is shallower, and sometimes Habitat or a sponsor has to resort to hiring paid crews.

After the United States withdrew from Vietnam in 1973, the draft was allowed to lapse and volunteers filled the ranks of the armed forces.

If these are unavailable a volunteer from the local community may fill the role instead.