根据句意和首字母提示补全单词。

1. His good friend, Mary, was k_____ in an accident.

2. My brother joined the army last year, so he became a s_____.

3. Bethune died of b_____ poisoning.

4. I most a_____ Norman Bethune. I would like to help others, too.

5. T. B. is a d_____ that damages the lungs.

在面向对象方法中，______描述的是具有相似属性与操作的一组对象。