The ventilation in the city was more polluted than the air in the forest, because the 
OPTIONS:
- ventilation was clean.
- air was clean.
air was clean.

When standing next to Kenneth, Aaron was ashamed of their upper body because 
OPTIONS:
- Kenneth was more flabby.
- Aaron was more flabby.
Aaron was more flabby.

Mary's family celebrates Christmas every year, while Tanya does not celebrate because 
OPTIONS:
- Mary is Jewish.
- Tanya is Jewish.
Tanya is Jewish.