volunteer voluntary volunteering voluntarily

Câu hỏi :

In the United States, almost everyone, at one time or another, has been a (1) _______. According to the US government statistics, about one-fifth of the American (2) _________ volunteer work each year. Americans have had the tradition of volunteering and (3)___ one another since the early days of the country. Americans volunteer not because they are forced or (4) ______ to do it. They (5)_____it! Traditional volunteer activities include (6)____  money for people in need, cooking and (7)___ food, doing general (8)_____  such as clean-up, and home (9)_____, providing transportation such as giving rides to the (10) ____ , and tutoring or mentoring young people.