根据句意和所给单词，在答题卷相应的横线上，写出所给单词的适当形式。Do you know these _______________ (play) names over there?
I think that Yao Ming and Liu Xiang are his_______________ (hero).
Our teachers always tell us to do our homework _______________. (one)
Of all the subjects, I like history_______________ . (good)
The Greens thanked the fireman for saving their_______________（life）