Please help me.

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I have a blog (commercemaster.blogspot.com). I have pasted some adsense advertisement there and I was started to earn also.But it is not regular.Some days it shows $5.60, but next days it shows $0.00. In report, more than 400 impressions per day is showing in average, Click is also showing 60 to 70 daily.But I am not understanding, why I am not getting credit for that? Can you help you please?