Fill ina/an in the boxes:ruler,eraser,atlas,pen,classroom,texbook

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In my classroom, I always keep a _____ in my pencil case. (pen)I needed to use an _____ to correct my mistake on the test. (eraser)The teacher asked us to turn to page 56 in our _____. (textbook)The student used a _____ to measure the length of the table. (ruler)When I was planning my road trip, I referred to an _____ to find all the different routes. (atlas)