Problem: Robert frequently tended to dominate the conversation with Aaron, because 
OPTIONS:
- Robert responded to basic social cues.
- Aaron responded to basic social cues.

My choice: Aaron responded to basic social cues.
[Q]: How does the sentence end?

The boy on the bike couldn't catch the boy on the skateboard, because the 
OPTIONS:
- bike was faster.
- skateboard was faster.

[A]: skateboard was faster.
QUES: Continue writing.

The skin of a human is smoother than the hide of an animal because the 

OPTIONS:
- skin is always moisturized.
- hide is always moisturized.
+++++++++
ANS: skin is always moisturized.
Problem: How does the sentence end?

Kevin would talk far more often at parties than Aaron for the reason that 
OPTIONS:
- Kevin was way more extroverted.
- Aaron was way more extroverted.
Answer: Kevin was way more extroverted.
sentence: Samuel was less confident the basketball team would win than Christopher because  OPTIONS:
- Samuel was more optimistic.
- Christopher was more optimistic.
complete: Christopher was more optimistic.
Input: Continue writing.

They sold their apartment and moved to a new house after she got pregnant, because the 
OPTIONS:
- apartment was too small.
- house was too small.

Continued:
apartment was too small.