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.