C.Natural gas prices
D.Clean fuel of choice
E.Disadvantages of natural gas
F.Natural gas consumption
27.Natural gas is stored deep________.
28.Natural gas is recognized as the most economical energy source_________.
29.When manufacturing many products,people commonly use natural gas____________.
30.It is estimated that by 2025 that natural gas demand in the United States will increase_________.
A.over the past 50 years
B.beneath the earth surface
C.by more than 50 percent
D.for more than four decades
E.as a raw material
F.for home energy needs
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