补全对话
Li Lei: 1 me, Tom. Do you have 2 eraser?
Tom: Sorry. I 3 .
Li Lei: Do you think David 4 one?
Tom: I think 5 . You can ask 6 .
Li Lei: David, may I have 7 eraser, please?
David: Sorry, Lucy has 8 eraser. Please go and ask her.
Li Lei: Excuse me, Lucy. May I 9 David's eraser?
Lucy: Certainly. Here you are. But you must give it back to him soon.
Li Lei: OK. 10 very much.
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