补全对话。
A: 1 ___2___ my math book?
B: Is it on the desk?
A: No, 3 4 .
B: Let me see. Is it on the bed?
A: Yes, it 5 . Thank you.
A: 6 my books in your backpack?
B: No, 7 8 . Sorry, I left them at home (忘在家里了).
A: Can you 9 them back to me this afternoon? I need them.
B: OK.
A: 10 .
1.________ 2.________ 3.________ 4.________ 5.________
6.________ 7.________ 8.________ 9.________ 10.________
