Sarah did not recognize Samantha in her costume at first, but then 
OPTIONS:
- Sarah heard her speak.
- Samantha heard her speak.
Sarah heard her speak.

Kyle took their flask to the concert, while Kenneth left his flask at home, because 
OPTIONS:
- Kyle wanted to stay sober.
- Kenneth wanted to stay sober.
Kenneth wanted to stay sober.

Christopher saved his money and didn't take risks but Nick like to spend all his and take many risks. 
OPTIONS:
- Christopher lived dangerously.
- Nick lived dangerously.
Nick lived dangerously.