读短文，判断正(T)误(F)。

      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 (没关系), 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.