A.What’s this? | B.What’s that? |
A.—Close your book, please. —OK. B. —I'm sorry, Mrs Liu. —Come in Tom. C. —What's this? —It's a blackboard. D. —Sit down, please. —Thank you. |
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. |