Problem: How does the sentence end?

Robert threw his PS3 controller at Lawrence because 
Answer: Lawrence had beat him in the game.

Problem: How does the sentence end?

Amy drove Christine to the vacation home because 
Answer: Christine was insecure about driving on the highway.

Problem: How does the sentence end?

Steven wanted to play miniature golf, but Benjamin refused, so 
Answer: Steven was denied their wishes.

Problem: How does the sentence end?

Christopher gave lessons to Michael , as 
Answer:
Michael had so little piano playing knowledge and experience.