补全对话
根据对话内容，在空白处写出恰当的句子，使对话意思连贯完整。所写句子应与所给的标点符号一致。（共5个句子，每句1分，满分5分）
A: Hi, Joe. I found a schoolbag on the playground. ?
B: No, it isn’t. My schoolbag is blue.
A: ?
B: It might be Nancy’s. She likes black.
A: . It may belong to a boy.
B: ?
A: Because there is a soccer ball and a model plane in the bag. Boys often like these things.
B: Oh, it must belong to Jim. I know he likes playing soccer, and he joined the model plane club last week.
A: . Let’s return the bag to him.