'We’d left Los Angeles with such relief, there was only the sun’s warmth on the roof to miss' Patricia Foster's essay …
A strong thesis statement is the foundation of an interesting, well-researched paper. A paper without a central claim to control the content and direction will leave the reader (and your teacher!) confused and unconvinced. Your thesis statement functions to capture the attention of the reader, provide information about the purpose and content of the paper, and to establish your stance on the subject as the author.
These patterns can give a "lift" to your writing. Practice them. Try using two or three different patterns for your introductory paragraph and see which introductory paragraph is best; it's often a delicate matter of tone and of knowing who your audience is. Do not forget, though, that your introductory paragraph should also include a thesis statement to let your reader know what your topic is and what you are going to say about that topic.
History and thesis essay writers are very careful to avoid plagiarism since it is considered to be a form of cheating in which part or all of someone else’s work is passed as one’s own. Useful guidelines to help avoid plagiarism can be found in the University of Ottawa document "Beware of Plagiarism". 
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