根据句意及汉语提示，写出各单词的正确形式，每空填一词。
They told me they all enjoyed their ______ (逗留) in Beijing last month.
Mr. Wu got an application from David, and he ________ (接受) it finally.
It is necessary for everyone to know the ______________( 重要 ) of wetlands.
She felt unhappy because her mother looked         (生气) at her.
If we don’t protect the wetlands, it will be_________(可能) to see these endangered birds.