Billy: May I come in?
Henry: Yes.
1． (Who / What) is it?
Billy:
2． (It / That) is Billy.
Henry: Come
3． (in / on).
Billy: Let’s play
4． (chess / ping-pong).
Henry: (Good / Bad)
5． idea. I like playing chess. Do you want some tea?
Billy:
6． (Yes / No), please.
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