综合填空。阅读短文，根据短文内容及首字母提示，在空白处填入适当的单词。
Nearly 2,000 years ago, during the Han Dynasty, there was a person called Ying Chen. One day, he invited Du Xuan to his house and treated him with wine. On the wall of the room h a red bow. Its shadow appeared in Du Xuan’s cup. Du Xuan took the shadow for a snake. He was f         but he didn’t refuse out of politeness. He drank the wine w his eyes closed.
When he was back at home he felt so sick that he couldh          eat or drink any more. He sent for the doctor and took some m         , but nothing could cure him. w         Ying Chen went to ask Du Xuan how he got so seriously ill, Du told him about the snake in the wine. Chen returned home, thought hard, b      he could not find an answer. S         the bow on the wall caught his eyes. “That’s it!” he shouted. He immediately sent for Du Xuan. He seated him where he sat before and offered him a cup of wine. Du Xuan saw the snake-like shadow again. Ying Chen said, pointing at the shadow, “That snake in the cup is n          but a shadow of the bow on the wall!” Now that Du Xuan knew w         it was, he felt much easier. And strange enough, his illness disappeared the next moment.
This story turned out to be the idiom “Bei Gong She Ying”.