Problem: How does the sentence end?

Lindsey let down Erin because 
Answer: Lindsey had agreed to come home and help their parents move but never showed up.

Problem: How does the sentence end?

Emily was always lagging  Jennifer in the math competition, as 
Answer: Jennifer had a math tutor .

Problem: How does the sentence end?

Jennifer found it easier to make friends than Betty because 
Answer: Jennifer was always very friendly.

Problem: How does the sentence end?

While deciding what to study at college Derrick chose business and Christopher chose music, you can say that 
Answer:
Christopher is artistic.