______ all the required papers, he didn’t answer the questions fluently in class.

 I don’t think it easy, even if we work hard, ______ the South Korea and the North Korea to sit down to talk at present.

______the importance of education, the villagers paid more attention to the schooling of the children.  

 He was busy writing the exam paper , only ___once in a while to check the time.  

Many of the one-family children are so accustomed to ______ that they react violently when they hear something different.