Problem: How does the sentence end?

The gym trainer was teaching everybody how to get bigger arms before legs, since the 
Answer: arms are weaker.

Problem: How does the sentence end?

Both the furnace and the air conditioner were turned off, so Janet turned on the 
Answer: furnace because it was cold.

Problem: How does the sentence end?

Tommy could not put the bed in the room because the 
Answer: room was too small.

Problem: How does the sentence end?

They coughed in the living room more than in the kitchen because the 
Answer:
living room was much dirtier.