When the person started choking, Betty but not Katrina performed the Heimlich maneuver because 
OPTIONS:
- Betty had very little knowledge of first aid.
- Katrina had very little knowledge of first aid.
Katrina had very little knowledge of first aid.

Steven but not Benjamin was a good speaker because 
OPTIONS:
- Steven took several linguistic classes in school.
- Benjamin took several linguistic classes in school.
Steven took several linguistic classes in school.

Gabe wanted to bark tan his leather jacket for winter, so he bought some bark and ground it into a powder. The 
OPTIONS:
- bark was big and chunky.
- powder was big and chunky.
bark was big and chunky.