In order to find an ads free app, I will prefer to use F-Droid instead of Google Play.
Recently, I downloaded a PDF of Stubium Biblicum （思高） Chinese Bible, with 7000 pages. I found that most of the PDF reader fail to read any page immediately. Only Dropbox built-in PDF viewer can do it.
At the end, I tried to use F-Droid, and found Librera Reader.
It is ads-free, and can read large PDF at any page instantly. Great!!
Favourite Apps 
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