阅读下面的短文，在空白处填入一个适当的词，或填入括号中所给词的适当形式。

    Look at the boy.is an English boy.first name is Alan.last name is Brown.(this) is his school. His school ID card number(be) 4564579. His teacher is Miss Black.(her) is a nice teacher. Look! What's(this) over there? It's a backpack. It's blue. It's(Alan) backpack.(he) red jacket is in it. Where iswatch? Oh, Alan lost it this morning.