Read the following text and answer the question

Each country has many people who voluntarily take care of others. Many students in the USA often spend many hours as volunteers in hospitals, orphanages or nursing homes. They read books to the people in these places. Sometimes the students just visit them , play games with them or listen to their problems .

For boys who no longer have fathers, there is a voluntary organization called Big Brothers. Students take these boys to baseball games and help them to get to know things that boys usually learn from their fathers .

Some other students take part in helping disabled children . They give care and comfort to them to help them to overcome their difficulties. During summer vacations , they volunteer to work in remote or mountainous areas to provide education for children.

Volunteers believe that some of the happiest people in the word are those who help to bring happiness to others.