Just go buy a few local magazines, newspapers and stuff then read the articles there, rewrite them and Presto! You have fresh never seen before content that AC will approve everytime.
Or better yet, go to you local library and find "how to" books from way back like 1920 - 1950 and write new articles based on those books.
It's a no brainer. Read and rewrite. I can't express that enough. Hell, give me a subject you are interested in and I will become an expert in it in less than 2 hours then have a 300 - 500 word article written about it that no one has ever seen. My fee is way more than $.50 though as I feel my articles are worth charging more for because I can write and speak proper english.
Any technique you decide to use when writing articles will never be as good as writing your own, brand new, never before seen anywhere articles. You must use all the popular keywords/keyword phrases several times in your articles. And if you do decide to outsource your article writing, then be sure to proof read the articles before you post them. If you are not happy with the proof read then have your writer fix it or do it yourself.
I can post 10 articles on AC and none will be rejected. Not all my articles are winners I admit, but never do I have an issue with getting declined because I make sure that the articles I post are genuine and never before seen on the internet. I found that once I began writing I actually had a natural talent for it, so no need to have ghostwriters.
Another thing to remember when outsourcing is to compare the article that was written for your subject to the yahoo and google search results. Most ghostwriters, when given a subject, will simply copy a simular article that they have previously written about the same subject. Or they will only change a few words or lines to make it appear unique which does not always work. AC is savvy to this type of behavior, so Unique content is king when using AC to get approvals. Don't be lazy and work hard for what you want. The pay off is a whole lot more rewarding.
Back to work!