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After that you can control which pages are available for CPM image ads by setting the individual ad code to Image and Text or text only.
With the "Image and Text" setting in the individual ad code you could get either PPC ads or CPM ads on that page.
With the "Text Only" setting in the individual ad code you won't get image ads obviously, but you might still get CPM text ads as well as PPC text ads, if I understand all this right.
When you are creating a site targeted campaign (CPM) through your adwords account, you get to type the website names to target your Advrt.
Also, google gives a list of websites to choose from.
What should i do to make my site available in that list?