WARNING Giveaways. The only one it got me with was the last one...
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I counted the right number of F's. And didn't get the answers it wanted for the others, until of course the last one, but then I saw that coming as you are being directed to an answer very obviously.
There are very few well known coutries beginning with D and even fewer well known animals starting with E. So they just force you mathematically to get the number 4 et voila.
Not sure about the other's I'm guessing there are just some averages at play? I wonder what it means that they didn't work on me?