Teenagers can make money to buy things for themselves if they have one or two part-time jobs, which is good for them, of course. However, there're ____(many) teenagers volunteering than having part-time jobs now. A recent survey ____(show) that 56% of teenagers volunteer to help charities, while only 39% ____(take) part-time jobs to make money. Parents also say that 82% of teenagers do something to help others in their lives.

    Sara Johnson,  ____ teacher at a high school in Chicago, realizes that teenagers are more ____ (interest) in joining in charities. She said, “I think that kids are realizing how ____ (importance) it is.” She believes that the teenagers in the younger generation do more in charities than her generation ____(do).Unlike other public high schools, Illiana Christian High School doesn't often ____(ask) its students to do public services, ____ most of its students still volunteer. Suzanne Hammer, a junior, said, “I don't understand why you don't take part in voluntary____ (activity) if you can. I think everybody should try to help others.

韩非子在描述远古社会自然环境时，写到“上古之世，人民少而禽兽众，人民不胜禽兽虫蛇。”因此，古人最需要的是 （   ）