资料题：In the Unites States, when finishing eating, you should put the knife and fork（　）。

Mr.and Mrs.Brown were going abroad for their holiday.They had a dog called Blackie which they were very fond of, but they could not take him abroad with them, so they looked for a good place to leave him in, and at last found a place which looked after dogs very well while their owners were away.They took Blackie there just before they left.At the end of their holiday, they got back to England very late at night, and as they thought that the place where BIackie was staying might be closed at the hour, they decided t wait until the next morning before going to get him back.When they brought the dog back home, Mr.Brown said to his wife, "Do you know dear,I don't think Blackie could have enjoyed his stay at that place very much.He barked all the way home as if he wanted to tell me something."Mrs.Brown looked at the dog carefully and then answered,"You are quite right, dear.He was certainly trying to tell you something.But he wasn't tying to tell you that he hadn't enjoyed his stay at the place.He was only complaining that you were bringing the wrong dog home."