根据句意及所给提示，补全单词或用单词、固定短语、固定搭配的正确形式填空。
I don’t know w_____________ to go or to stay. What do you think?
It is difficult for me _________________（lift）the heavy stone.
A few              （世纪）have passed, the story has been told by a lot of people.
I hear she is_____________（严重地）ill in hospital. Let’s go and help her.
Please don’t _________________（生……的气）Mary. You know she is always honest.