Nancy is an English school girl. She studies in a middle school. She has a little brother. His name is John. John is only four. Nancy likes him very much. Today is Sunday. Nancy wants to do her homework. She takes out her pencil-box and opens it. "Oh, dear! Where's my pen?" She can't find her pen. She goes to ask her brother in his bedroom. "John! I can't find my pen. Can you see it?  Oh, what are you doing with my pen? " "I'm writing to my friend, Peter." John answers. "But how can you? You don't know how to write! " "It doesn't matter. Peter can't read. " John says. ,. How old is Nancy's brother?
Five. Four. Six. Three.