1) it's quite a long book. there are 350-page/350 pages. 2) five-star/five stars hotels are the most expensive. 3) the oldest building in the city is the 1000-year-old/1000 years old castle. 4) do you use the twelve-hour/twelve hours clock or the 24-hour/24 hours clock? 5) it's only a three-hour/three hours flight from london to milan. 6) there are 60-minute/60 minutes in an hour. 7) this painting is ancient, it's over six-hundred-year/six hundred years old. 8) it was one-of-a-kind/one of a kind masterpiece.
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