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.

The collision on the bumper destroyed the hood , but the chassis was still intact, since
OPTIONS:
- hood was defective in an accident.
- chassis was defective in an accident.
hood was defective in an accident.

We had to spray herbicide on the corn, but didn't have to for the wheat, as the
OPTIONS:
- corn was impervious to disease.
- wheat was impervious to disease.
wheat was impervious to disease.