11.   The geology of the area is well known, he said, and the fields are already producing.

12.   The field had been producing, but output had declined because the government lacked cash to buy new equipment and drill new wells.

13.   While the field produced some spectacular successes and failures, its overall performance was decidedly lukewarm.

14.   But petroleum exploration is a long-range process, industry leaders say, with no certainty that the most promising fields ever will produce a drop of oil.

15.   The Bt fields not only produce bigger yields but also higher quality corn.

16.   The consortium has been reluctant to support the Turkish route because of the high cost and uncertainty over how much oil the Caspian fields will produce.

17.   The field could produce roughly the same amount of oil Denmark uses over three years, the board said.

18.   The field has produced a large body of work examining the black experience in America and beyond.

19.   The oil companies are reluctant to support the project because of the high cost of the Turkish route and uncertainty over how much oil the Caspian fields will produce.

20.   The oil companies have been reluctant to support the Turkish route because of the high cost and uncertainty over how much oil the Caspian fields will produce.