There were a lot of big and small events in school,but we don't tell the stories here.

　　Now they are in Grade eight ,they have some new friends,Dick,Jane,Alice and Bingley.They are be familiar with their maths teacher.

　　It is before midterm examination.There is an important thing.

　　Mr.Liu made a text and the mark would be in our report cards.But there was a quarrel about the text.Many students said they saw lots of classmates have the key of the text and they copied the key in their desk drawer.

　　Dick and Jane are poor in math,so they went to tell Mr.Liu about this thing with other students.

　　Mr.Liu was very angry at this thing.But he didn't criticize the students who copied the key because he wasn't sure if they copied the answer and maybe he didn't know some of the copiers' name.

　　How will Mr.Liu dispose event?