Got into my library's summer reading around the same time I found this bingo. So I've got several squares filled, but still a way to go. I've dropped off with my reading habit, so glad there's still time.
So far, going for the second column.
Supplemental material - Dragon's Teeth and Thunderstones, a book I didn't especially like about how past civilizations perceived and used fossils. OR, Professor and the Madman, a fun narrative history of the creation of the Oxford dictionary. TBH, I'm not 100% that they both had extra material, but I believe they did. Non-fiction will usually have a bibliography or something.
Author from a different continent (+translated) - Ogawa's Memory Police. Author is Japanese. Haunting, near sureal atmosphere in a dystopian novel. One of my favorite books actually.
Group forms for a reason - Nothing yet, but I saw The Hobbit as a suggestion for it, and I've been meaning to read that for a while.
Prominent nature aspect - Hatchet. I remember always seeing the cover in school libraries and the bookshelf in my old house. But I never tried to read it. Picked it up since my niece was trying to read it. It's all about a kid stranded and trying to survive in nature.
Author deceased - I, Robot by Asimov felt like a good thing to read in today's world, and I rather enjoyed my time with it.

