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The principle of the heating system in this building is that pipes ________ hot water from the boile...

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Natural gas comes partly from Canadian fields.  Bottled gas is more expensive than utility gas.  Equipment for home heating has been considerably improved.  Solar heating dominated America in 2000.  
33 percent.  31 percent.  21 percent.  14 percent.  
33 percent.  31 percent.  21 percent.  14 percent.  
used.  burned.  delivered.  pumped.  
used.  burned.  delivered.  pumped.  
are repairing    have been repairing    will be repairing    repair  
Should    Will    Would    Shall  
used  burned  delivered  pumped  
Natural gas comes partly from Canadian fields.  Bottled gas is more expensive than utility gas.  Equipment for home heating has been considerably improved.  Solar heating dominated America in 2000.  
1978.  1960.  1997.  2000.  
1978.  1960.  1997.  2000.  
Gas.  Electricity.  Wood.  Oil.  
Gas.  Electricity.  Wood.  Oil.  
33 percent  31 percent  21 percent  14 percent  
Natural gas comes partly from Canadian fields.  Bottled gas is more expensive than utility gas.  Equipment for home heating has been considerably improved.  Solar heating dominated America in 2000.  
Natural gas comes partly from Canadian fields.  Bottled gas is more expensive than utility gas.  Equipment for home heating has been considerably improved.  Solar heating dominated America in 2000.  
Gas.  Electricity.  Wood.  Oil.  

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