QUES: Continue writing.

Logan had a dirtier car than Joel had because 
+++++++++
ANS: Joel had gone to the car wash.


QUES: Continue writing.

Kayla loves to play sports, but Jennifer really can't stand it because 
+++++++++
ANS: Kayla is more athletic.


QUES: Continue writing.

Katrina went to the gym and worked out a lot more than Lindsey. 
+++++++++
ANS: Lindsey developed abs more slowly.


QUES: Continue writing.

The letter that Joel has written is being read by Adam, so 
+++++++++
ANS:
Adam is the editor.