Problem: How does the sentence end?

Christopher aced the exam, but Matthew failed it. The parents gave 
Answer: Matthew a disappointed look.

Problem: How does the sentence end?

Nick was lazier than Jason so 
Answer: Jason agreed to clean up the mess he made in the bedroom.

Problem: How does the sentence end?

Monica loved to eat potato chips but not Cynthia so 
Answer: Cynthia had a very flat belly.

Problem: How does the sentence end?

Adam tried to treat the disease of Jeffrey but was unsuccessful because 
Answer:
Adam did not have much experience treating that disease.