You can change the Lexile of the reading without changing the content. There are questions attached to each article you can use.
https://dcmp.org/topics - "Described and Captioned Media Program" offers video on a diverse set of topics, captioned, for free.
www.ducksters.com/ - Fun games/quizzes on geography, history, biography, and science.
Screencast on Edpuzzle. The tutorial includes: 1) how to get started, 2) Merge on to Google Classroom, and 3) How to look for online lessons.