It's = It is : a book,  a teacher, a pen,  a rubber, a pencil ,  a ruler , a classroom, a school, a student , a chair , a board , a crayon , a car, a ball, a doll, They're = They are: books, teachers, pens, rubbers, pencils, rulers, classrooms, schools, students, chairs, boards, crayons , cars, balls, dolls ,

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