adsense help

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I need help in my adsense. Ive heard that adsense is a good source to earn money online but I have a friend whose site has bee rejected. The site has its own domain. right now im planning to make a site out of free packages. The Free web sites i can register. because I still cant afford to buy a domain thats why i'll be using those free web pages. What kind of site do i need to be approved by adsense and what freeweb sites you can suggest that is acceptable by adsense?