When the teacher assigns a task to the class, Miss Assistant goes to help the first student, who doesn't seem to know what's going on. The first thing that strikes me is her irritated tone, which asks the student "How is it possible that you don't know what we're doing ?! So you're normal?". The same thing happens with about the other three students.
The first thing that strikes me is her irritated tone, which asks the student "How is it possible that you do not know what we are doing ?!