Article Required - 500 words

I require 30 articles to be written. I will provide keywords. Based on these keywords, you will be required to write 500 word article. Ensure that keyword is repeated twice in your 500 word article. Adequate research on the topic is required. I want unique articles and it needs to pass copyscape. There are some rules which I would like to clarify on the onset a) I can provide only 1$ per article. So writers who charge more than 1$ per article, please refrain from bidding here. You will not be selected. b) I will hold all the rights related to the article c) The article needs to be unique and pass copyscape d) Keyword given needs to be present in the article e) Article length of 500 words f) Writer should be available on chat messenger ( preferably google talk or yahoo ) g) I require minimum 10 articles per day. g) And ofcourse the content grammar needs to be perfect. Please send sample of your work. Also be ready to write 1-2 sample article for me. Payment would be done only after all the 30 articles are received. ( Payment after delivery strictly). Also I wouldn't offer escrow option. The writer thus selected would get regular projects from me.