The global warming is more and more serious，for which human beings ________.

 We all felt a sense of_______when we saw so many overseas Chinese coming back safe and sound from Libya.

 一What will happen to the children if Jim and Mary    ?一I don’t know but I think it’s a really terrible thing. 

 These stories are about the everyday life of ordinary people who         the great dangers in China over the past few years.

The old rules have to be    _____because they only applied to the circumstances that existed when they were made a hundred years ago.