In addition to wearing the actigraph and doing the tests, the volunteers kept logs of their activities.

Success may depend on whether volunteers in neighborhood organizations keep the sites current with content that can draw visitors, he said.

The volunteers keep the place quite clean, and they take turns sleeping over at the safe house so that someone is always present.

He said the volunteers have just kept growing.

With the exception of summer staff, volunteers keep the Museum operating.

Next to the Kindergarten volunteers teach at several other schools, run sports programs and keep on looking for new projects.

Over the years volunteers adopted or removed the rabbits but not fast enough to keep the population under control.

Fifty volunteers keep the store open six days a week under the leadership of a full-time manager.

The volunteers keep track of numbers of visitors, where they're from, and what they seek.

Eventually, volunteers could not keep abreast of an increasingly complex artistic and organizational environment.