根据句意及汉语提示，写出各单词的正确形式，每空填一词。

小题1:They told me they all enjoyed their ______ (逗留) in Beijing last month.

小题2:Mr. Wu got an application from David, and he ________ (接受) it finally.

小题3:It is necessary for everyone to know the ______________( 重要 ) of wetlands.

小题4:She felt unhappy because her mother looked         (生气) at her.

小题5:If we don’t protect the wetlands, it will be_________(可能) to see these endangered birds.

我国《合同法》规定，承诺撤回的条件是撤回承诺的通知应当在( )到达要约人。

A．要约到达受要约人之前
B．受要约人发出承诺通知之前
C．承诺通知到达要约人之前
D．受要约人发出承诺通知之后