11.[完型填空] Volunteering is becoming more and more    1    in the modern world. Volunteering can not only make others happy, but also make our lives meaningful. By helping others, we get rewards, because we can have    2    success and pride. What's more, volunteering offers us the chance to practise the knowledge that we have learned from books. Volunteering can also improve our    3    skills, such as communicating with others and working as a team. Last but not least, when we are working as volunteers, we have the    4    to practise important skills that we may use in the future. There are many chances for us to do volunteer work. By volunteering , we can find out who we are and what we really want to do. Therefore, volunteering is    5    for us.