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McGraw Hill
Glencoe: Writer's Choice: Grade 6 Proofreading Practice
This site offers two proofreading exercises in which students proofread for errors in spelling, capitalization, punctuation, and usage, and then retype passages correctly. When finished they click Answers for feedback.
Online Writing Lab at Purdue University
Purdue University Owl: General Writing Resources
This helpful resource details the process of writing, including how to plan, write, and revise. Content also includes the different types or genres of writing, and exercises in grammar and mechanics.