A.He is a boy. | B.She is a doctor. |
A.Hi, I'm Sam. | B.Good morning. |
A.Hello, Mike. | B.Hello, I’m Mike. |
A.Yes, they are. | B.No, they aren't. | C.Yes, it is. |
A.Good afternoon, class. | B.Good morning, class. |
A.Hello, Yang Ling. |
B.Good morning, class. |
C.Good afternoon, class. |
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