从方框中选择合适的选项填在横线上，使对话完整。
A. Hi B. thank you C. Good morning
D. Bye-bye E. How are you
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Sam:（1）.________,Mary.
Mary: Hello, Sam.
Sam: Good morning.
Mary（2）_________.
Sam:（3）_________?
Mary: I’m fine,（4）____________.
Sam: Goodbye, Mary.
Mary:（5）___________,Sam.