题目内容：

根据句意和汉语注释，在答题卡标有题号的横线上，写出单词的正确形式。

1.If you step into this field, you will find many interesting         (发明)

2.Please check that all the personal information have been         (正确地) entered.

3.We were all unhappy to learn that the picnic was          (取消) .

4.In fact, the film is based on           (古代的) history.