题目内容：

根据句意，用括号中所给单词的正确形式填空。

1.The clothes may be one of the       . (pioneer)

2.I want to be a teacher in the future because I like to see so many      children. (live)

3.The sun gives us light and       . (hot)

4.He spends as much time as he can       speaking French every day. (practice)

5.He failed the exam because of his       . (careless)