Students in each group must have the same number of 8-12 people by students in each group required the ability to read equal. All students read the same story
The number of students in each group must have 8-12 people, students in each group must have the ability to read on equal terms. All students read the same passage
Students in each group to the 8 - 12 people. The students in each group to levels of reading ability in inequality. All the students to read the same story