I read this tip in "Living with Intensity" but I've never tried it. When a child tends to blurt out or ask a lot of questions, the teacher will give the student an "IQ Sheet". The sheet is divided into two columns, one labeled Ideas and the other Questions. Instead of blurting out the student is asked to write down their ideas and questions. The teacher then will spend a few minutes with the child at the end of the day going over the sheet. Just a thought.