题目

If you are in town in a western country, you will often see people walking with their dogs. It is still true that a dog is the most useful animal in the world, but the reason why one keeps a dog has changed. Once upon a time, a man met a dog and wanted it to help him in the fight against other animals, and he found that the dog listened to him and did what he told it to. Later people used dogs for the hunting of other animals, and the dogs didn't eat what they got until their masters agreed. So dogs were used for driving sheep and guarding chickens. But now the people in the towns and 把下面的词语补充完整。 聚（　　）会（　　）千（　　）万（　　） 莘莘（　　）（　　）立雪（　　）（　　） 孺子（　　）（　　）春风（　　）（　　）