My name is Dongdong. I'm nine. I'm a pupil. This is my father. He's a driver. This is my mother. She's my English teacher. This is my grandpa. He's a doctor. This is my grandma. She's a nurse.

-This is my mother.

-                a teacher.

-This is my brother.

-                a doctor.

This is ___ father, ___a doctor, This is___bag.