[Q]: How does the sentence end?

Ian slipped on oil that Donald spilled all over the kitchen floor. 

[A]: Donald was sorry.


[Q]: How does the sentence end?

During the concert the ukulele sounded worse than the guitar because the 

[A]: ukulele was out of tune.


[Q]: How does the sentence end?

Benjamin cared a lot less in his gardening than Kyle because 

[A]:
Kyle had fewer important things to do.