根据短文内容，填空。

     Hello! My name is Sun Wei. Here is an American boy. His name is David Smith. He is twelve. And

I am twelve, too. David is in Class Three, Grade One.  I am in Class Three, Grade One, too. He is

Number Eight, Row Five. I am Number Five, Row Four.

1. David _______ an American boy.

2. His  _______ _______  is Smith.

3. Sun Wei and David are in Class _______, Grade _______.

4. _______ is Number Eight.

5. _______  is Number Five.