Case 2 I have an American friend. I have invited him several times, and at last he invited me to his home one day. He told me to get there at 3 p.m. I thought we could chat and have a meal together. I gave him a Chinese calendar, a silk scarf and a bottle of Chinese white wine. He only took out a dish of nuts, a plate of bread and a bottle of wine. After two hours’ chat, I found there was no hint of a meal and said good-bye to him. He only gave me a box of chocolate as a present for the New Year. After I got home, I found the box already been opened. I was very surprised. Question: What surprised me?