| A．Goodbye, Mum. | B．Good afternoon, Mum. | C．Good morning, Mum. |
| A．Good morning. | B．Good afternoon. |
| A．Hello, Bobby. | B．Goodbye, Bobby. | C．Hi, I’m Bobby. |
| A．Good evening, class! | B．Good afternoon, Miss Li! | C．Good morning, class! |
| A．Good evening, Mike. | B．Good afternoon, Mike. | C．Good morning, Mike. |
| A．Good morning. | B．Good afternoon. |
| A．Good afternoon. | B．Good morning. | C．Thank you. |
| A．Good afternoon. | B．Good morning. | C．Hello. |
| A．Good morning. | B．Good afternoon. |
( )| A．—Good morning. —Good morning. | B．—Good afternoon. —Good afternoon. |
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