Here’s a possible way to fill in the gaps in the text:

In the United States, almost everyone, at one time or another, has been a (25) **volunteer**. According to U.S. government statistics, about one-fifth of the American population does volunteer work each year. Americans have had the tradition of volunteering and (26) **helping** one another since the early days of the country. Americans volunteer not (27) **because** they are forced or paid to do it. They enjoy it! Traditional volunteer activities include raising money for people in (28) **need**, cooking and giving food, doing general labor (such as clean-up projects and home repair), providing transportation (such as giving rides to the elderly), and tutoring (29) **mentoring** young people.