is it allowed to put in text "this page is sponsored by": and then put google ads after it or below it?
The most accurate answer comes from the AdSense Team so go and ask them. But I don't think it would be appropriate. Just name them "Sponsored Links:"
https://www.google.com/adsense/policies?sourceid=asos&subid=ww-ww-et-HC_entry&medium=link I thought "Sponsored links" would be violation of AdSense Policy... Silly me...