Sam is a four year old boy. He lives in the USA with his parents. His father works in a hospital. He goes there by subway. He can read books on it. His mother is a worker in a factory. She often walks to work. They usually do some shopping for the next week on' Sundays. But this Sunday they are going to the park to have a picnic because it is Sam's birthday.

    Look! Sam has many birthday gifts. One of them is a nice drum(鼓). He likes music. Of course Sam likes the drum very much. He makes a noise(噪音) with it all day. His parents don't mind(介意). They are happy. But one of their neighbours(邻居) doesn't like the noise. One day, she brings a knife and says to Sam, “Sam, do you know, there's a very nice gift in your drum? Here's a knife. Open the drum and let's find it." "OK!" Sam answers happily.