空，使短文完整、通顺。每词限用一次。
There was a young college student. he always thought that he had chosen a wrong course,so he played （game）every day and didn't study at all. Day after day, he became very （bore）. One day, he put a note in the homework that he handed in, saying, " It is said that today's college students are （cheap）than potatoes. Do you agree?" The professor looked at the note but said .
Later that day, the student was about to leave the classroom when the professor called him back. The professor （take） a small potato that had sprouted (发芽) out. "Do you know how much it ( cost)?" he asked the young student. "It' s soft and poisonous (有毒的). Nobody wants to buy it even if it's free. " After saying that, the student threw the potato .Then the professor (show ) him another potato. It was half as big as a football and perfectly round. "This potato is organic (有机的). It is not only large and fresh but also free of pollution. it is very expensive. it sells well around the world. " The young man was impressed by what the professor said. The professor put the big potato his hand and said, " Be such a potato, young man. "
