假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文．文中共有10处语言错误，每句中最多有两处．错误仅涉及一个单词的增加、删除或修改．增加：在缺词处加一

Question

假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文．文中共有10处语言错误，每句中最多有两处．错误仅涉及一个单词的增加、删除或修改．
增加：在缺词处加一个漏字符号（∧），并在其下面写出该加的词．
删除：把多余的词用（\）划掉．
修改：在错的词面划一横线，并在该词下面写出修改后的词．
注意：1．每处错误及其修改均仅限一词：
2．只允许修改l0处，多者（从第11处起）不计分．
Dear Sir/Madam，
I am writing to express a complaint about the Metropolitan Museum．I am visiting the museum from 2：00to 5：00on yesterday afternoon．I would have enjoyed a perfect afternoon unless it had not been for an unfortunate incident．
I was in the Chinese Painting Section with its beautiful display of world famous works while suddenly I was astonished to smell cigarette smoke．I turned back and saw a young man smoke．I looked after an attendant but none．
You will agree that there should an attendant in every room and that the no-smoking rule should be firm carried out．I look forward to receive your reply at your convenient and hope for the solution to the matter．
Yours truly，
Johnson．

Answer 1

Dear Sir/Madam，
I am writing to express a complaint about the Metropolitan Museum．I am visiting the museum from
                                                                                                      was
2：00 to 5：00 on yesterday afternoon．I would have enjoyed a perfect afternoon unless it had not been for an unfortunate incident．
                                                                                                                         if             
I was in the Chinese Painting Section with its beautiful display of world famous works while suddenly
                                                                                                                               when
I was astonished to smell cigarette smoke．I turned back andseea young man smoke．I looked after an attendant but none．
                                                                                         saw                 smoking                for
You will agree that there should∧an attendant in every room and that the no-smoking rule should be
                                              be                          
firm carried out．I look forward to receive your reply at your convenient and hope for the solution to the matter．
firmly                                          receiving                         convenience
                                                                       
Yours truly，
Johnson

1．am-was 考查时态．后面的时间状语2：00 to 5：00 on yesterday afternoon是过去时间，所以用一般过去时．
2．unless-if  考查连词．句意为：如果不是因为那件小事，整个下午我会很开心的．所以用if．unless表示"除非…"．
3．while-when  考查连词．本中表示我在看展览，就在此时，我闻到一股烟味"，此时只能用when．
4．see-saw 考查时态．与前面的turned是并列关系，所以还用过去时．
5．smoke-smoking  考查非谓语动词．see sb doing，看到某人正在做某事．
6．after-for 考查介词搭配． look for 是寻找的意思．
7．should  后面加上be  考查谓语动词． 此处应该是there be 句型结构，所以应该有be．
8．firm-firmly 考查副词．此处用来修饰carry out，所以应该用副词．
9．receive-receiving  考查动名词．to为介词，后面应该用动名词作宾语．
10．convenient-convenience 考查名词．物主代词后面应该用名词．