A few words of English translation will help.

In class, the teacher found a student chewing gum and sticking his leg into the middle of the aisle. The teacher was unhappy and said sternly to the students, "Spit out your gum and put it in your leg."

This is a little joke. But as lyly2306 said, there are some mistakes in English itself.

If the clssroom should be changed into a classroom, it should be caused by negligence;

The word "strenth" is not found, but as a coordinate structure of chowing, it should also be changed to the form of "ing".

Pleasure is a noun, so it is not appropriate to use it here. You should use an adjective.

Personal views are for reference only.