根据下面内容，回答题：
If the teacher asks a question， you are expected to give an answer. If you do not understand the question， you should raise your hand and ask the teacher to repeat the question. If you do not know the answer， it is all right to tell the teacher that you do not know. Then he or she knows what you need to learn.
There is no excuse for not doing your homework. If you are absent， you should call your teacher or someone who is in your class and ask for the assignment. It is your responsibility to find out what assignments you have missed. It is not the teacher"s responsibility to remind you of missed assignments.
You must not be absent on a test day. If you are seriously ill， call and let the teacher know you will not be there for the test. If your teacher allows make-up tests， you should take the test within one or two days after returning to .class. Serious illness is the only reason for missing a test.
Be on time ! It is considered rude to be late. Also， it bothers other students. If you must come in late， be sure to do it quietly. Have your books and papers out of your bag before you come into the room. Then go to your seat and sit quietly. In the U.S. it is not necessary to knock before you enter the classroom. Most of the ELC teachers will give you a low grade if you are often late.
Have your book out and be ready to begin when the class starts. Your teacher should not have to ask you every day to take out your book. Be sure you have a paper and a sharp pencil ready.
If you are puzzled with the question teacher asks， you should _________ first. 查看材料
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