1) It _______a door. a) is b) isn't 2) They ______chairs. a) are b) aren't 3) This _______paper. a) is b) isn't 4) They _______chairs. a) are b) aren't 5) It _______a bookcase. a) is b) isn't 6) They ______rubbers. a) are b) aren't 7) It ______ a pen. a) is b) isn't 8) They ______ desks. a) are b) aren't 9) They ______ windows. a) are b) aren't 10) It ______ a playground. a) is b) isn't

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