I remember in 4th grade that we were doing the SRA activities daily. SRA was an odd system with stories and articles on cards organized by colors with reading comprehension and vocabulary questions related to the readings. It’s not clear to me whether it worked or not but I do remember that it was sort of fun to work individually reading all the different stories and articles.
There was also the 4th Grade Weekly Reader that we read. In terms of books, I think that I was still reading the Enid Blyton books such as The Magic Far Away Tree and the Five Run Away Together. I think that year I started to read the Narnia Books in 4th grade.