We examined the effects of teacher supports in enhancing teachers' open-ended questioning in pre-k activities. The blended teacher supports included online video demonstrations of questioning techniques and companion workshop activities. Twenty-five teachers received the blended supports while the control group did not. The data consisted of classroom video observations, teacher surveys, and teachers' access time to teacher supports. Our quantitative analyses revealed that the treatment group teachers used more open-ended questions than the control group teachers. The students in the treatment group used a greater number of different words and complex sentences than those in the control group. (Contains 1 figure and 3 tables.)