Problem: How does the sentence end?

After trying to call the meeting to order with a gavel, Tracy tried using an airhorn, and the 
Answer: airhorn had great effect.

Problem: How does the sentence end?

The dog liked Carrie but it didn't like Christine very much because 
Answer: Carrie always fed it.

Problem: How does the sentence end?

Katrina yelled at Elena because 
Answer: Katrina saw muddy footprints all over the new white carpet.

Problem: How does the sentence end?

Currently, Carrie is being helped to beat their alcohol addiction by Katrina, so 
Answer:
Carrie is the current addict.