QUES: Continue writing.

His mask was convincing enough to get him into the building, but he was stopped at the office, since the 
+++++++++
ANS: office had stronger security.


QUES: Continue writing.

Erin took time to eat breakfast at the table, but Monica had to eat on the run, because 
+++++++++
ANS: Erin was early for work.


QUES: Continue writing.

The students at the school opted for a shorter recess than lunch break because they had more fun at the 
+++++++++
ANS: lunch break .


QUES: Continue writing.

Lindsey used a common method for the problem unlike Cynthia because 
+++++++++
ANS:
Cynthia was a creative thinker.