Is this the reason at the meeting for his carelessness in his work

Have you seen the CCTV news on TV– Yes, _________children had a good festival on the _________Children’s Day.

How did it ______ that he knew where we were? [ ]

Why are you so — Because our ping-pong player Wang Liqinhas won the world championship.

Must I finish my homework at school— No, you_____. you can do it at home