Problem: How does the sentence end?

Tom wanted to learn to play the ukulele instead of the guitar because the
Answer: guitar was common.

Problem: How does the sentence end?

Laura was moving and needed to borrow a box from Tanya because
Answer: Laura did not have any boxes.

Problem: How does the sentence end?

Elena needed to go get the necessary materials for Christine's project so
Answer: Christine waited at the house.

Problem: How does the sentence end?

William told Brett that he had started taking these pills off of the TV to increase his mental stamina.
Answer:
William was enthusiastic about them.