[Q]: How does the sentence end?

Nelson helped Robert improve a boxed cake because 

[A]: Robert had entered a contest and wanted to win.


[Q]: How does the sentence end?

Making food is difficult for Angela, while Christine loves to be in the kitchen. 

[A]: Christine is probably the baker.


[Q]: How does the sentence end?

Kenneth led Aaron through the vows to consecrate and make official his marriage, because 

[A]:
Kenneth was an excellent officiant.