Mr. Grey was the manager of a small office in London. He lived in the country, and went to work by train. He liked walking from the station to his office if it wasn't raining, because it gave him some exercise. One morning he was walking along the street when a stranger stopped him and said to him, "You may not remember me, sir, but seven years ago I came to London without any money in my pockets. I stopped you in this street and asked you to lend me some money and you lent mePS5, because you said you were always ready to take a chance   to give a man a start on the way to success." Mr. Grey thought for a few minutes and then said, "Yes, I remember you. Go on with your story!" "Well," answered the stranger, " _ ?" Mr. Grey liked walking to his office because   _  .
he couldn't pay for the buses he wanted to save money he wanted to lose weight he could do some exercise on the way