Becky is a little girl. She is only five. She does not go to school and of course, she can't read or write. But her sister Mary is a schoolgirl. She is ten. One day, Mary sees her little sister at the table with a pen in her hand and a big piece of paper in front of her. " What are you doing, Becky? " she says. " I'm writing a letter to my best friend Sally." says Becky. " But how can you? " says her sister. " You can't write." " Well," says Becky, " It doesn't matter (沒關系), because Sally doesn't know how to read." ( ) 1. Becky goes to school every day. ( ) 2. Mary can read and write. ( ) 3. Sally can read Becky's letter. ( ) 4. Sally is a friend of Becky's. ( ) 5. Sally is a schoolgirl.