[Q]: How does the sentence end?

Derrick was very skilled in calligraphy but not Randy because 

[A]: Derrick had a steady hand.


[Q]: How does the sentence end?

Dennis lost more weight than Nelson over the summer, because 

[A]: Nelson didn't take any walks outside.


[Q]: How does the sentence end?

Christopher's carpet has few stains on it, while Randy's is very dirty. The carpet of 

[A]:
Randy is 15 years old.