Quote little sage
When a preschooler does not complete an activity in the time you allot, it does not make them "dull". I would be more likely to think that you had not selected an appropriate activity.
Prepare extra materials for the students who complete tasks more quickly. You may need a teaching assistant to help mind the children who finish early.
thank you so much little sage for you assistance..it was helpful.. i ll try to select appropriate activities.