This site is a tutorial on how to make self-graded quizzes in Google Docs for free. This is a quick and easy way to give feedback to students with little effort.
It has a at least four sites on all the following tabs.
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This page contains very clearly written advice and steps on how to revise a paper. I think it would definitely come in handy for both inexperienced and experienced writers.
The website has many links to other websites that offer assistance to students and teachers alike for many subject areas. It offers homework help, tutorials, as well as help with lesson plans.
This site is a checklist of resources to supply your substitute teacher with in the event of your absence. This is a good site to utilize to prepare several "emergency" packets.