The following link is an example for I-485 interfiling including the sample letter. You may just refer to this sample letter for your draft of response to the RFE though this example is somewhat different from your case:
Here is an example
所有跟帖:
• 老公沒有I-485 receipt#,是不是就continue 我的呢? -please_2- ♀ (220 bytes) () 07/28/2011 postreply 09:57:00
• 回複:老公沒有I-485 receipt#,是不是就continue 我的呢? -863211- ♂ (714 bytes) () 07/28/2011 postreply 11:39:59
• 對不起,還有問題。在線等。 -please_2- ♀ (473 bytes) () 07/28/2011 postreply 12:01:27
• 回複:對不起,還有問題。在線等。 -863211- ♂ (646 bytes) () 07/28/2011 postreply 12:14:08
• By the way, -863211- ♂ (82 bytes) () 07/28/2011 postreply 12:29:09
• 回複:By the way, -please_2- ♀ (70 bytes) () 07/28/2011 postreply 12:55:21