将下列句子排成一段完整的对话。 (1)Is this your purse? (2)No, it isn't.It's David's. (3)Oh, it's my purse.Thank you. (4)Perhaps your purse is in your desk. (5)Oh, dear.Where's my purse? (6)You're welcome. ____→____→____→____→____→____
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.