不知为什么朋友说发不了帖，我替她发一下。原文如下：
前几天收到ＲＦＥ信，信里一共有四个RFE，让我8月1日之前做出回答，下面要的文件我有的已经提供过了，是不是移民局弄丢了，具体问题如下：
The first RFE:
You must submit a currently dated letter from your intended permanent employer, describing your present job duties and position in the organization, your proffered position (if different from your current one), the date you began employment and the offered salary or wage. This letter should be in the original and signed by an executive or officer of the organization who is authorized to make or confirm an offer of permanent employment. The letter should indicate whether the terms and conditions of your employment-based visa petition (or labor certification) continue to exist.
我的问题：
我的工作单位没变，这封信报485时也交过，我认为是照着上面写的拟稿的，如果说移民局整丢了，我倒不担心，如果没有整丢，那么怎么说才让移民局明白我工作单位写的信 indicate whether the terms and conditions of your employment-based visa petition (or labor certification) continue to exist？
the second RFE:
Submit a list describing your employment history since your last lawful admission to the U.S. This list shall include the name and location of each employer, the job titles, the exact dates of employment in the month/day/year format. Please note that the list must identify all employment undertaken as a student to include curricular practical training and optional practical training.
我的问题：
我可能不完全记得CPT和OPT的确切工作时间，我只记得月份和年，具体开始的哪一天不记得，但是我记得
我全职工作的开始与结束时间，如果我在学生期间只写个大概时间，就是八九不离十的时间，可以吗
The third RFE:
Please submit evidence that any and all employment since your last admission on February 22, 2001 has been authorized by this service. Such evidence may include copies of
Employment Authorization documents granted to you by this service
Form I-797 approval notices, showing you were granted status in an employment-authorized nonimmigrant classification;
Copies of Form I-94 Arrival/Departure Records showing you were admitted to the U.S. in an employment-authorized nonimmigrant status; and/or
Copies of properly annotated Form I-20 AB if applicable.
这个没问题，我都交过，只好再重新交一遍。
The fourth RFE:
Please submit copies of all I-20 AB’s issued to you regarding your student status. This should include the I-20AB documenting your transfer to University A.
当学生期间，曾经去过一次加拿大，但是对方没有给新的I－94，但是在I－20上盖了章， 这个盖了章的I－20交485时没有交。看来现在得补上。
另外，在填485时，LAST PORT OF ENTRY没有填加拿大，反而填了DETROIT，这可能是移民官要所有I－20的原因。问题A：是不是移民局能查到我最后入关的时间。问题二：LAST PORT OF ENTRY填错了，有很大关系吗？问题三：我的RFE移民官是NSC/EX0656，是不是我交上的RFE还会回到他那批？
Thanks a million for your replies.