What was the resolution of teacher?
Now what should teacher do here is to devise the 'sign' language to communicate with students. Also she needs to make sure that the superintendent won't have any doubt while questioning students.
She should ask all the students to raise hands for every question that is being asked by superintendent. However, those who know correct answers should raise right hand & rest of all should raise left hand. This way she would be able to know the students who knows the correct answer & choose any of them to answer the question.
All raised hands to each question would definitely leave great impression on the superintendent.
Note : We are assuming superintendent not smart enough to notice that students raising different hands for different questions.