Upstream B2 Teacher's Book for Workbook

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Book for Workbook' loading='lazy' src='data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+P+/HgAFhAJ/wlseKgAAAABJRU5ErkJggg==' data-src='https://reader030.cupdf.com/reader030/viewer/2022033000/55cf9a4b550346d033a120c6/html5/thumbnails/7.jpg' width='140' height='200' /> Page 8 <img data-url='document/upstream-b2-teachers-book-for-workbook.html?page=8' data-page='8' class='cut-thumb lazyload' alt='Page 8: Upstream B2 Teacher's Book for Workbook' loading='lazy' src='data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+P+/HgAFhAJ/wlseKgAAAABJRU5ErkJggg==' data-src='https://reader030.cupdf.com/reader030/viewer/2022033000/55cf9a4b550346d033a120c6/html5/thumbnails/8.jpg' width='140' height='200' /> Page 9 <img data-url='document/upstream-b2-teachers-book-for-workbook.html?page=9' data-page='9' class='cut-thumb lazyload' alt='Page 9: Upstream B2 Teacher's Book for Workbook' loading='lazy' 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