短文改错（共10分，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 whenever the father said,“now , my son, why have one more try? open your hand or hold your fingers straight as you saw 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.