If you've ever wanted to explain subject and predicate agreement to an impatient elementary school student, have I got some sympathy for you!
I also have a website to recommend: K12Reader Reading Instruction Resources for Teachers & Parents.
In addition to simple instructions and free worksheets (with answer keys) the site also includes reading recommendations, by grade, as well as more than 20 book award lists, from Caldecotts to Golden Kites and a few I'd never heard of.
Have fun with that reading, grammar, and spelling homework. Just remember to let your kids do some of it...