Problem: How does the sentence end?

After finishing the exams, the teacher graded the papers with blue ink instead of red ink because the 
Answer: red was used up.

Problem: How does the sentence end?

Jessica received a lot less scams than Amy because 
Answer: Amy wasn't careful with information online.

Problem: How does the sentence end?

Laura took their car to Christine's shop for an oil change, and 
Answer: Christine was pleased to give great service.

Problem: How does the sentence end?

Monica was organizing a surprise party for Mary over the weekend because 
Answer:
Mary wanted a party.