The rising house price and the high income tax rate have become the biggest ______ of the ordinary people in China today．

Mary was praised by the headmaster in public and on that _______ she was simply proud.

       He told me that she had met one of my old friends in the street ________.

 This event not only raised _______ of world hunger, but also raised lots of money to help starving children.

The manager says he needs an assistant that he can depend on to deal with the problems that may happen in his _______.