The Longman Academic Reading Series is a five-level series that helps develop student writing from basic composition of sentences and paragraphs to academic essays and research papers.
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http://usafiles.net/1RJ7/Longman_Academic_Writing_Series_1_Sentences_to_Paragraphs.pdf
http://usafiles.net/1RJ8/Longman_Academic_Writing_Series_2__Paragraphs.pdf
http://usafiles.net/1RJ9/Longman_Academic_Writing_Series_3___Paragraphs_to_Essays.pdf
http://usafiles.net/1RJa/Longman_Academic_Writing_Series_4__Essays.pdf
http://usafiles.net/1RJb/Longman_Academic_Writing_Series_5__Essays_to_Research_Papers.pdf