题目内容：

根据句意，用所给单词的适当形式填空。

1.They say she is ___________(suit) for the job as an accountant.

2.The accident was caused by ________ (粗心).

3.Do you know when America __________ (discover)?

4.Miss Li did what she could _______(help ) her students.

5.What difficulty the little boy has __________(finish) the task by himself!