61.   Just this past year, oil prices have doubled on world markets, putting a squeeze on profits from producing plastic.

62.   Journalists in Tehran said that gold prices had doubled over the last few weeks.

63.   Living standards dropped dramatically because many prices almost doubled when controls were lifted.

64.   Many buyers flooded shops because of rumors that food prices would double by next week.

65.   Oil prices have doubled in the past six months.

66.   On Wednesday the price had doubled.

67.   Prices have doubled or tripled in some places, in anticipation of a housing boom by the overseas Vietnamese community.

68.   Prices have nearly doubled in the past two years, forcing publishers to devise a range of money-saving responses.

69.   Since Monday, prices have doubled for basic goods and services.