book, chair , , book, notebook , , eraser  , desk, , chair, pen, It _ a book, isn't, is, It's a book.It _ a notebook , isn't , is, It _ a desk, is, isn't , It's a chair.It _ a desk, is, isn't , What is it?, It's a chair, It's a desk. It isn't a chair., What is it?, It's an eraser , It's a pencil. It isn't an eraser..

Unit1 lesson2

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