are you able to finish a book that doesn't interest you at all?

The books that I bought are usually the ones that interest me. If I was fooled by the fancy covers and the summary at the back and found the book boring, I might put it somewhere first. Then if one day I found the book again, I will attempt to read it again. Most books that don't interest me I can finish reading them in the second go. Or the third. Though some books are lost already somewhere beneath all my piles of books ^^;

I can, if I absolutely have to, but usually I don't. I have no qualms with putting down a book that I have no interest in reading. The exception is if the book is for school, but sometimes even then I don't finish it and just find other ways of doing the work or project. Since entering high school I haven't had to read as many bad books, but in middle school there were a few. In 7th grade I was assigned to read both Roots and 1776 and I didn't finish either of them. And in 8th grade I was reading Eragon for an independent reading project and I didn't finish that either. Wikipedia FTW.

No. If I find a book too boring I stop reading, unless I have some particular need to read it. I quite like open endings, so I'm happy to just not care what an ending is if the book's uninteresting. I then give those books away to charity shops or return them to the library.

Yes I am even when the book is so boring I just have to know what happens at the end

No. Sometimes I might put it aside for months/years and then try it again, but if it really sucks/doesn't interest me, I can't finish it.

yes and its even greater accomplishment as compared to reading the book that i liked.

Impossible. I throw it away once I see that it isn't interesting.