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You have the Safe Assigment of Blackboard platform, that help you online to check which part of the texts is copied or not quoted.
Also there is some tutorial and podcast that help your students to improve this and more skills.
Internet can be one of the tool to improve the skill but students can not rely totally on net.The very important point while using net the student s should be aware of plagiarism. Copy pasting is not the key to improve writing skill.