补全下列对话：
A: Hi! Sonia. This is your letter.
B: 1.________ Oh, it's 2.________ my pen pal, Mike.
A: What's in it?
B: There are some 3.________ in it. Look! In the first photo, he's 4.________ basketball at school. In the second photo, he's swimming at the 5.________ .
A: How nice! What are they 6.________ in the next photo?
B: They're 7.________ dinner.
A: And the last photo?
B: He's 8.________ his sister, Gina. Gina is doing 9.________ homework. Mike is 10.________
