根据所给提示，写出单词的正确形式。每空限填一词

    Mickey Mouse is the symbol of American cartoons. Everyone knows and loves the black mouse.

    Why did Mickey Mouse （变得） so popular? One of the main  (原因) is that Mickey was like a common man, but he  (总是) tried to face any danger. In his early films, Mickey was  (不幸的) and had many problems such as losing his house or girlfriend, Minnie. However, he was  (准备好的) to try his best. People went to see "the little man" win. Most of them wanted to be like Mickey.