阅读下面材料，按照句子结构的语法性和上下文连贯的要求，在空白处填入一个适当的词或使用括号内单词的正确形式填空。

Speaker 1: Hello, I am Frank. I'm  American boy. And I'm in Hangzhou now. I found a pen. What color is it? It's blue. It  (be) not Linda's. Her pen is red.

Speaker 2: Good afternoon, my name is Susie. Here are two  (photo) of a blue notebook. The notebook is mine, but I don't know where  is. My mother gave it to me as a birthday present. My pen is in it, . Can you help me? Thank you  your help.

Speaker 3: Hi, I'm Lily. I found a schoolbag on the playground. The schoolbag is yellow and white. And there are some things in it — a  of keys, a pencil box  a computer game. I think it must be a  (boy). Is this your schoolbag? Call me 701804426.