[Q]: How does the sentence end?

Betty had to clean up after Amy all the time, since 

[A]: Betty was always being tidy.


[Q]: How does the sentence end?

Tanya has a lot of negative emotions, Amy is very happy therefore 

[A]: Amy is more mentally healthy.


[Q]: How does the sentence end?

Joel was talented with water-based paint while Dennis loved to sing. 

[A]:
Joel was shy on stage.