[Q]: How does the sentence end?

Kim used a sans-serif font in the letter to her boyfriend, but a serif font in an email to her boss, because she felt the 

[A]: sans-serif font was harder to read..


[Q]: How does the sentence end?

Woolen scarf is better in cold weather than the cotton scarf because the 

[A]: cotton scarf is thin.


[Q]: How does the sentence end?

Robert had a much easier time when riding horses than Logan, because 

[A]:
Robert had extensive lessons as a child.