阅读下面短文，按照句子结构的语法性和上下文连贯的要求，在空格处填入一个适当的词或使用括号中词语的正确形式填空。
Long long ago, there was a man who lived in a village. One day, he went to a market and did some ____ (shop). He ____ (sudden) found two boxes. Both the two boxes ____ (be) very beautiful and the man fell in love with them at the first sight. So he bought them.
After he got home, he didn't know how to use the two boxes. He thought it over and decided to do something ____ (specially). He decided to put all of his happiness in the yellow box and all of his sadness in the black box. He thought that it was funny to do that.
A few days ____ (late), the yellow box was very heavy, ____ the black box was still light.
He didn't know ____. He decided to open the two boxes and found out the ____ (true). He opened the yellow box and found nothing. Then he opened the black box and saw ____ hole at the bottom (底部).
Then he smiled to ____ and said, “Happiness is for me. Let sadness go.”
