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If you study in America，you need to know some classroom customs．

When the teacher asks a question，you   1    to give an answer．If you do not understand the question，you should put up your hand and ask the teacher to   2    the question．If you do not know the answer，it is all   3    to tell the teacher that you do not know．Then he or she may know   4   you need to learn．

There is   5   for not doing your homework．If you are absent（缺席的），you should call your teacher or someone   6   is in your class and ask for the homework．It is not the teacher's responsibility to remind you   7   your missed homework．

You must not be absent on a test day．If you are   8   ill，call and let the teacher   9   you can't be there for the test．If your teacher allows you to make up the test，you should take the test within one or two days after returning to class．Serious illness is the only reason for   10   a test．

Be on time! It is considered rude to be late．Also，it disturbs other students．  11   you come late，be sure to be quiet．Have your books and papers out of your bag   12   you enter the room．Then come in and go to your seat quietly．In the U.S. it is not necessary to knock when you enter the classroom．If you must leave during a class，do so quietly．There is no need to ask for the teacher’s permission．Before entering a teacher’s office or   13   office with a closed door，knock first，then wait to   14   in．

__15   in class is considered impolite by many teachers．Some teachers may ignore it，but you should get permission first．

1．A．expected                B．are expecting        C．are expected           D．expect

2．A．pardon                         B．repeat                  C．ask                        D．raise

3．A．wrong                   B．right                    C．stupid                    D．helpful

4．A．what                     B．how                    C．how many              D．why

5．A．no use                   B．no time                C．no chance              D．no excuse

6．A．those                     B．who                    C．which                    D．whose

7．A．on                         B．to                        C．in                          D．of

8．A．hardly                   B．strongly               C．badly                     D．mostly

9．A．knows                   B．to know               C．know                     D．knew

10．A．not attending        B．taking                  C．not missing            D．passing

11．A．For                     B．Once                   C．Even if                   D．Although

12．A．after                    B．while                   C．before                    D．as soon as

13．A．any                     B．all                        C．anyone                   D．a

14．A．be noticed            B．be invited             C．be stopped             D．let

15．A．With a hat            B．In a hat                C．Putting on a hat      D．Wearing a hat