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.​