“The sound was familiar one.” What sound did the doctor hear? What did he think it was? How many times did he hear it? (Find the places in the text.) When and why did the sounds stop?

Explanation

The doctor lived in a room which was full of rats. He heard the sounds of the rats. There was a regular traffic of rats to and from the beam. He heard the sound thrice. The sound stopped suddenly as rats had seen a snake.