You are presented with the question "gas does what after going through a furnace into a cottage" and the following answer choices: 
- expands
 - becomes toxic
 - has odor
 - warmth
 - Rise
 - moves
 - burning
 - compresses

Now knowing that if gas is heated then that gas will expand and cottages are heated by gas space heat or gas furnaces, choose the best answer.


 

 expands        