A boy was one day sitting on the steps of a door. He had a stick in one hand, _______ in the other hand a large piece of bread and butter, which somebody had kindly given him. While he was eating it and singing a song happily, he saw a poor little dog quietly _______ not far from him. He called out to it, "Come here, poor dog!"

Hearing this, the dog woke up, rose with its ears _______ and wagged(摇摆) its tail. Seeing the boy eating, it came near him. The boy held out to it a piece of his bread and butter. As the dog stretched(伸出) out its head to take the _______, the boy quickly drew back his hand and hit it _______ on the nose. The poor dog ran away, _______ loudly, while the cruel boy sat, laughing at the trick he had done.

A gentleman, who was looking from a window on the other side of the street, saw what the _______ boy had done. Opening the street door, he called him to _______ over, at the same time _______ up one dollar between the finger and thumb(大拇指).

"Would you like this?" said the gentleman.

"Yes, if you ________, sir," said the boy, smiling, and he quickly ran over to seize (抓) the ________.

Just as the boy stretched out his hand, the gentleman hit ________ on the knee with an umbrella. "Why did you do that?" shouted the boy angrily. He made a very ________ face and cried, "I didn't hurt you, nor ask you for money."

"________ did you hurt that poor dog just now?" said the gentleman. "He didn't hurt you, nor ask you for bread and butter. As you served it, I have served you. Now, remember it can feel as well as you, and learn to behave ________ towards animals in future."