Here are some American classroom customs:

     If the teacher asks a question, you are expected to give an answer. If you do not understand the question, you should put up 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 (缺席), you should ear your teacher or someone who is in your class and ask for the assignment(作业). It is your responsibility (责任) 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 he 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(认为) rude to be late. Also, it disturbs 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. If you must leave during class, do so quietly. There is no need to ask the teacher's per-mission. Entering a teacher's office or any office with a closed door without knocking fast is not accept-able. Knock first, then wait to he invited in.

      Wearing a hat in class is considered impolite by many teachers. Some teachers may ignore it, but you should ask permission first.

1. What should a student do if he or she doesn't understand the teacher' s question?

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2. If a student misses a class, how can he or she find out the assignment?

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3. What is the only reason for missing a test?

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4. Is it necessary for a student to knock before he or she enters the classroom ?

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5. What about wearing a hat in class?

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As everyone knows, there are many 　16　 of transportation in the world, like bicycles, buses, ships, trains and 　17　 .
If you are in big  18　like Shanghai or Beijing, maybe you get to school   19  a subway or you have to 　20　 to school because you live in a mountain village. Here I am just trying to say something about　21　 .
Ten years　22　, bicycles were very　23　in most villages.  24　 family had one or two of bicycles. Children got to school by bicycle; 　25　 rode bicycles to go shopping. Then motorcycles (摩托车)   26  to become popular. People no longer rode bicycles because motorcycles ran   27  faster.  But now, in some countries，bicycles are highly suggested
  28  the main means of transportation. They think buses, cars and motorcycles pollute(污染) the air but bicycles   29  . So, to live a low-carbon life,   30  a bike is a good way.

As everyone knows, there are many 　16　 of transportation in the world, like bicycles, buses, ships, trains and 　17　 .

If you are in big  18　like Shanghai or Beijing, maybe you get to school   19  a subway or you have to 　20　 to school because you live in a mountain village. Here I am just trying to say something about　21　 .

Ten years　22　, bicycles were very　23　in most villages.  24　 family had one or two of bicycles. Children got to school by bicycle; 　25　 rode bicycles to go shopping. Then motorcycles (摩托车)   26  to become popular. People no longer rode bicycles because motorcycles ran   27  faster.  But now, in some countries，bicycles are highly suggested

  28  the main means of transportation. They think buses, cars and motorcycles pollute(污染) the air but bicycles   29  . So, to live a low-carbon life,   30  a bike is a good way.