题目内容：

根据句意，写出格单词的正确形式。

1.The Chinese government is trying its best to search for the lost _________ (fly). We hope that all the people can survive.

2.I think the hat is one of their ___________ (wife). Please look after it well.

3.My dad went to shanghai on _______________ (busy).

4.Have you read any books ________(recent).