He _____ be really difficult at times even though he ,generally speaking, is a nice person. 

This basketball team had lots of excellent players, so its fans never expected that it ____ have failed in the final. 

--- ______ I take some photos in the hall ? ---No, you ________.

I think that's unlikely to happen, but if that ______ occur, both America's and China's interest would be severely damaged.

--Who’s singing in the next room? Is it Lucy?---It       be her. She has gone to New York.