it is not easy for them to go through an interview process (neither for a visiting visa nor an immigration visa).
- No English requirement to apply any visa
(1) apply for a visiting visa. I heard that chance of success is low because I am a citizen. Is it true or it depends?
- http://blog.wenxuecity.com/blogview.php?date=200709&postID=10310#B2
(2) file a petition (I-130 and I-485). I don't have any problem to initiate the process right now, but how long is it going to take generally?
- 6 mos to 1-2 yrs for them to be here.  
If you prefer them to come ASAP, apply for B-2.
回複:Questions about parents visiting / immigration please
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                    Thank you so much for your information. It is really helpful.
                     -sarahylq- 
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                        10/20/2009 postreply
                                                11:17:59