If you are looking for supplemental materials to help teach reading, you should definitely take a look at the ReadWorks website. It was created by a non-profit, so everything is free. There are skills based and literature based units and lessons for grades K-6 (Use the “lessons and units” link on the top menu). I think the non-fiction passages and questions would be especially useful (go to the non-fiction passages link- they have over 1,000!). One of the best things is that the lessons are now aligned with the Common Core ELA Standards. Integration with Google Classroom makes it really easy to assign work to students.  http://www.readworks.org/