--- Come on, please give me some ideas about the project.---Sorry. With so much work ____ my mind, l almost break down..
He has given me so much help that I really wanted to do something for him ________.
Mr. Li is absent today. What do you consider ________ to him?
The reason ________ he refused to attend the meeting was that they didn’t give him an invitation earlier.
Our English teacher requested that the homework ________ tomorrow morning.
Smoking, which may be ________ fun for some people, is ________ cause of discomfort for the people around him.