More to explore:
spelling list and reading comprehension by grade level, and other language arts actives.
K12Reader ... Reading Instruction Resources for Teachers & Parents. This site includes: reading instruction, spelling, sight words, and grammar worksheets, phonics, writing, and reading comprehension.
Reading worksheets and articles for parents and teachers, covering sight words, vocabulary, reading comprehension, grammar, and other reading essentials.
K12 Reader - Reading Instruction resources
Reading Instruction Resources K-12~includes worksheets for a variety of language arts subjects