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

Sam:（1）.________,Mary.
Mary: Hello, Sam.
Sam: Good morning.
Mary（2）_________.
Sam:（3）_________?
Mary: I’m fine,（4）____________.
Sam: Goodbye, Mary.
Mary:（5）___________,Sam.