| A．Come in, please. | B．Come on, please. | C．Sit down, please. |
| A．Close the door, please. | B．Open the window, please. | C．Open the door, please. |
| A．Sit down. | B．Stand up. | C．Thank you. |
| A．Please open the window. | B．Please close the window. |
| A．OK. | B．No. | C．Yes,please. |
| A．Open the window. | B．Close the window. |
| A．Yes ,Miss Green. |
| B．I’m sorry, Miss Li. |
| C．Come in, please. |
| A．It’s a rubber. | B．What’s this ? | C．What’s that ? |
| A．Open the door. |
| B．Don’t open the window. |
| C．Don’t open the door. |
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