How do you get Google AdSense to post ads on different sections of a webpage?

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Is there ways available that I can put different keywords for different menus of each webpage? I have a website with many menu bars. Somehow whenever I click different sections, all the same google ads appear. Each menu has a different characters, so I would like to customize ads for each sections. Is this possible to have different google ads for each webpage? Waiting for your reply. Thanks.