i cannot see my adsense??

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when i use computer at home my blog look fine.. adsense show up.. but one day my friend ask me "why not use adsense?" i'm shock i say to him that i use and there is advertise in my blog.. but my friend say that when he open using his computer there is not adsense in my blog? so i go to cybercafe try open my blog there and what my friend say is true, no google adsense in my blog.. why that happen? if peole can my adsense how they want to click? please tell me why? thank you!!