1. It's quite a long book. There are (450 page / 450 pages).
450 page
450 pages

2. I didn't have any change. I only had a (twenty-pound / twenty pounds) note.
twenty-pound
twenty pounds

3. I looked down and there were two (ten-pound / ten pounds) notes on the ground.
ten-pound
ten pounds

4. At work in the morning I usually have a (15-minute / 15 minutes) break for coffee.
15-minute
15 minutes

5. There are (60-minute / 60 minutes) in an hour.
60-minute
60 minutes

6. It's only a (two-hour / two hours) flight from London to Madrid.
two-hour
two hours

7. My office is on the tenth floor of a (twelve-storey / twelve storeys) building.
twelve-storey
twelve storeys

8. I work (five-day / five days) a week. Saturday and Sunday are free.
five-day
five days

9. (Five-star / Five stars) hotels are the most expensive.
Five-star
Five stars

10. Sam's daughter is (six-year-old / six years old).
six-year-old
six years old

11. The oldest building in the city is the (500-year-old / 500 years old) castle.
500-year-old
500 years old

12. Do you use the (twelve-hour / twelve hours) clock or the 24-hour clock?
twelve-hour
twelve hours