阅读短文，根据括号内所给单词的适当形式填空。
Does helping others make you happy? Yes. All of us could (are) volunteers and help people in need.
Judy, an American girl, had a heart problem. She was sad. Her classmates tried (cheer) her up. Judy was so sick that she needed (have) an operation (手术). But her family was poor. Her parents hoped (get) help from the public (公众). A TV station soon set up a call-in center for Judy. Many people (call) up Judy and helped her out. At the same time, Judy's classmates handed out flyers (传单) (tell) others about Judy's story. Judy and her parents were really moved (感动的).
We can (do) lots of volunteer work. We can volunteer in hospitals, old people's homes and so on. We can also (help) homeless people or volunteer (clean) up parks. Volunteering is not only a great way to help people, but also a great way (make) new friends and have fun.