Fill in the missing prepositions and adverbial particles on off of in by during
(….) World War II, incendiary bombs dropped (…) some cities created “fire storms.” These swept cities like violent windstorms, killing tens (…) thousands (…) people. (…) some cases, destruction (…) life and property by fire was greater than that caused (…) atomic bombs. Often other bombs were dropped (…) the same time to destroy water mains and cut (…) the water supply. This made the work (…) the fire fighters more difficult.