Volunteers are people who do a job for the satisfaction  of helping others. Volunteers do many different types of jobs.Some volunteers read books onto tapes so that people with poor eyesight can listen. Some volunteers deliver meals to elderly or sick people. Some volunteers help tourists   who visit a city during a major event like the Olympic Games or the Commonwealth Games. Volunteers help whenever a community is hit by a natural disaster . Volunteers assist(,)in putting out bush fires.They might also help to evacuate people from areas that have been flooded or hit by an earthquake or tsunami . A community may not recover without the help of volunteers. Some communities require volunteers more than others. Communities that don't have much money require a great deal of help from volunteers. Communities with a large number of elderly people might require more help from volunteers than communities with more young people.Without volunteers, some communities couldn't operate. Why do some communities require volunteers more than others? Because   _  .
they have more money they have more elderly people they have more young people they have more children.