Better Explanations/ Other sites that you can refer too.
FOIL. foil explanation. http://www.mathsisfun.com/definitions/foil-method.html
muscles. muscles explanation for kids. http://www.scholastic.com/teachers/lesson-plan/magic-school-bus-flexes-its-muscles
poetry.poetry for kids. http://www2.nkfust.edu.tw/~emchen/CLit/Poetry.htm.
religions.religions. http://www.uri.org/kids/world.htm