Problem: How does the sentence end?

Natalie was hired to install a new wall for Monica because 
Answer: Natalie is the employee.

Problem: How does the sentence end?

Monica wanted to walk a dog but Amy did not because 
Answer: Amy was naturally lethargic.

Problem: How does the sentence end?

The doctor proceeded with the injection to put in the vaccine and not the treatment because the 
Answer: vaccine was what the patient ordered.

Problem: How does the sentence end?

Matthew made a complex graph but not Ian because 
Answer:
Ian taught a class at a basic level.