短文改错（共10小题，每小题1分，满分10分）
One day a child was playing with a vase in great value．               
He careless put his hand into it．Hard as he tried,                   
he could not pull it out．His father tried his best, too．               
but their efforts were in a vain．They were thinking of breaking      
the vase when the father said, "Now, my son, why have          ．      
one more try? Open your hand or hold your fingers out             
straight as you see I doing, and then pull．" To his                
surprise, the child says, "I can’t hold my fingers straight         
like that, because I don’t want to drop my penny．" Thousand of us         
sometimes are so busy hold on to the world’s worthless ．     
penny that we cannot achieve liberation．