⑴May I come in?                        A. Yes, Mum.

⑵Open the door, Liu Tao.          B. No, it isn't.

⑶What's this?                             C. Yes, please.

⑷Don't sleep, Wang Bing.         D. Come in, please.

⑸Would you like a sweet?         E. It's a ball.

⑹Is this your book?                   F. I'm sorry.

⑺Good morning, class.              G. OK, Mr. Green.

⑻Please listen to me.                 H. Good morning, Miss Li.

⑼What colour is it?                    I. Thank you.

⑽Please sit here, Grandpa.        J. It's green.