将下列句子排成一段完整的对话。 (1)No, it isn't.Perhaps it's Yang Ling's. (2)Helen, What's that over there? (3)It's a key. (4)Hi, Yang Ling.Is this your key? (5)Is that your key? (6)Oh, yes.Thank you very much. (7)Not at all. ____→____→____→____→____→____→____
把下列句子重新排列,组成一段对话。
Good afternoon, Amy. Let’s clean the classroom.
OK. Let me clean the blackboard.
Good afternoon, Sarah.
Then let me clean the desks and chairs.