One day, a rich man met Tom. The rich man asked him, "I heard you are very clever and nothing is difficult f{#blank#}1{#/blank#}you. Can you tell me w{#blank#}2{#/blank#}you are so clever?"

    Tom answered with a smile on his face, "Oh, I am not clever. Maybe it is be-cause you are too foolish." The rich man became very angry, of course.

    Tom said, "Please d{#blank#}3{#/blank#}be angry with me. If you don't believe what I said, now let me ask you a very simple question; If you have a group of sheep, I g{#blank#}4{#/blank#}you another group. Then, tell me, how m{#blank#}5{#/blank#}groups of sheep do you have? " "Oh That's the easiest question in the world！ One and one is two. Anybody knows that. I have two groups of sheep, of course."

    Tom laughed and laughed and said, "You are quite w{#blank#}6{#/blank#}, I'm afraid. Two groups of sheep put together is still o{#blank#}7{#/blank#}group. That's the easiest question in the world, isn't it?"