11.   Would it be possible that a nail was driven through the soil stack, and sewer gases are coming in?

12.   An expert from the Kansas Geological Survey said the gas may be coming from an old gas well.

13.   But they had to discard the idea because there is no video equipement on the outside of the station to see where the gas is coming out.

14.   Officials said all the gas came to the surface through old wells that had been capped and forgotten as the city was built around and above them.

15.   Officials said all the gas came to the surface through old water wells that had been capped and forgotten as the city was built around and above them.

16.   She recalled standing in a gas chamber at Auschwitz with her sister and aunt, but the gas never came.

17.   The gas had come from two canisters thought to have contained pepper gas set off inside a crowded nightclub early Sunday just as the lights were cut.

18.   The gas comes from the state oil monopoly Petroleos de Venezuela and prices nationwide are set by the government.

19.   The gas would come by pipeline from Russia into Serbia.

20.   The gas comes from an offshore field in Burmese waters in the Andaman Sea.