判断正误，正确的写T，错误的写F。

     Susan is a little girl. She is five years old. She doesn't go to school and doesn't know how to read and

write. But her sister Mary is a school girl. She is ten.

     One day, Susan sits at the table with a pen in her hand and a piece of paper in front of her. "What are

you doing, Susan?" Mary asks.

     "I'm writing a letter to my friend, Rose." Susan says.

     "But you can't." Her sister says. "You don't know how to write." 

     "Well," Susan says. "Rose is only four. She doesn't know how to read."

( )1. Susan is a maths teacher. She is a good girl.

( )2. Mary knows how to read and write.

( )3. Susan doesn't know how to read and write.

( )4. Rose studies very hard.

( )5. Rose is over five years old.