English is _________ useful language in the world.

The Voice of China became one of _________ TV showslast year.

I was deeply impressed ________ the speech by the mayor of Shanghai before the final voting for EXPO 2010

He went down into the cold water and after ________seemed a long time, he came out

Did you return the book on me Why can’t I find it anywhere—_______. You were writing a letter at your desk at that time.