A. —Sit down, please. —OK. B. —What’s this? —It’s a robot. C. —Open the window, Meimei. —All right, Mum. D. —Please close the door. —OK. |
A.Open your book. | B.Close your book. | C.Stand up. |
A.Stand up. | B.Sit down. | C.Come in. |
A.Sit down, please. | B.Thank you. | C.I'm sorry. |
A.Good morning. | B.I'm sorry. | C.Goodbye. |
A.Please sit down. | B.Please stand up. | C.Please come in. |