阅读下面材料，在空白处填入适当的内容（不多于3个单词）或括号内单词的正确形式。
Millions        words have been said about young people in the United States. There are reasons for this great interest in their ideas, _ _(feel) and actions. Today there are about eight million Americans in the colleges and universities. The young under twenty-five make __  nearly half of the American population, many of       will be in power in the U.S.    (nature), their ideas are important to everyone in the country, and    is necessary for the older people to understand   they think and how they feel. College students today have strong opinions about right and      . They are deeply interested in making a     (good) life for all the people, especially for those who have never   (give) a fair chance before.