Peter and Mike are very good friends. They are in the same class at school. They often go to school and play t{#blank#}1{#/blank#}, and they often visit each other's home at weekends, too.

    Now they are b{#blank#}2{#/blank#} eight years old. Peter's mother has got a new baby. Peter is very glad to have a little brother, so he is always talking about his younger brother to Mike.

    At first Mike is very interested in the new baby because he doesn't have any sisters or brothers. But after some time he begins to get tired of Peter's endless talking about it. He also feels a little jealous (嫉妒) of his friend.

    One morning before class, when the two boys m{#blank#}3{#/blank#} at the school gate, Peter says to Mike cheerfully, "Do you know, Mike, my little brother, has put on nearly half a pound in weight this week."

    "That's not much at all," answers Mike. "I know a baby who can put on more than ten pounds a day."

    "Oh, that can't be t{#blank#}4{#/blank#}," answers Peter. "W{#blank#}5{#/blank#} baby is it?"

    "An elephant's," says Mike.