[Q]: How does the sentence end?

The librarian tried to store the old books on the shelves but the
OPTIONS:
- shelves were too large.
- books were too large.

[A]: books were too large.

[Q]: How does the sentence end?

Karen was filling the jewelry display at her store from the new box of products that were shipped in. By that afternoon, the
OPTIONS:
- display was empty.
- box was empty.

[A]: box was empty.

[Q]: How does the sentence end?

Shawn bought a guitar that came with a case and an extra string, but the
OPTIONS:
- string was too big for the car.
- case was too big for the car.

[A]:
case was too big for the car.