阅读下面短文，并根据短文后的要求答题 (请注意问题后的词数要求)。
Every country has many good people who help to take care of others. Some high school and college students in the United States often spend many hours as volunteers in a hospital, orphanage (孤儿院) or home for the aged.
They read books to the people who must be in these places or they just visit them and play games or listen to their problems. Other young people volunteer to collect food or money, or they work in the homes of people who are sick or old. They paint, clean or repair their houses, do their shopping or mow their lawns.
There is a group of volunteers to meet almost every need. For boys who no longer have fathers there is an organization called Big Brothers. College students and other men take these boys to baseball games or on fishing trips and help them to know about things that boys usually learn from their fathers.
Every city has a number of clubs where boys and girls can go play games or to learn crafts. Some of these clubs have movies or organize short trips to the mountains, the beaches, museums or other places of interest. Most of these clubs use many high school and college students as volunteers because they still remember the problems of younger boys and girls. Volunteers believe that some of the happiest people in the world are those ________________________.
What does the passage mainly talk about? (within 10 words)
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What do volunteers usually do in the home for the aged? (within 15 words)
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Please fill in the blank in the last paragraph with proper words or phrases to complete the sentence. (within 8 words)
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What else would you do if you got a chance to be such a volunteer? (within 10 words)
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What does the underlined word “they”( in the last but two line) refer to? (within 5 words)
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