It is a good example of a site that many people think _____ to change.

---- Pity you missed the lecture on nuclear pollution. ---- I _________ it, but was busy preparing for a job interview.

He suggested the problem worth paying attention ______ at the meeting.

 Peter ______ be really difficult to deal with at times even though he’s a nice person in general.

--Listen! Someone is singing in the next room．Who         it be? Is it Wei Fang? --No．It         be her．She is at school now．