A: Hello. Nick! Have you {#blank#}1{#/blank#} David?

B: No, I haven't. What' wrong?

A: I found a yellow jacket on the playground. I think it is {#blank#}2{#/blank#}.

B: It can' be his. The jacket is much too small for him.

A: Then it {#blank#}3{#/blank#} be Bob's. I saw him on the playground just now.

B: But Bob' jacket is black.

A: {#blank#}4{#/blank#} do you think it could be?

B: Let me have a look. Oh. It must be John's.

A: Why do you think so?

B: Look! I found his school ID card in one of the pockets(口袋).

A: You're right. Let' go and give it to him.

B: OK. He is in the library and {#blank#}5{#/blank#} books. Let's go.