The behavior of Megan was much better than Betty because 
OPTIONS:
- Megan was very nice and polite .
- Betty was very nice and polite .
Megan was very nice and polite .

Andrew was trying to brush the matted hair on his dog but wasn't having much luck because the 
OPTIONS:
- brush was too strong.
- matted hair was too strong.
matted hair was too strong.

Jessica was light headed and confused but not Elena because 
OPTIONS:
- Jessica had been exposed to harmless fumes.
- Elena had been exposed to harmless fumes.
Elena had been exposed to harmless fumes.