Preheat oven to 350 degrees F (175 degrees C).
In a saucepan bring 2 cups water to a boil.Add rice and stir.Reduce heat, cover and simmer for 20 minutes.
Melt margarine in a medium skillet over medium heat.Saute onions and celery until tender.
In a 2 quart casserole dish combine onions, celery, cooked rice, broccoli, mushroom soup and processed cheese spread; mix well.
Bake in preheated oven for 35 minutes.
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