Problem: How does the sentence end?

Mary used the calculator to find the solution instead of the abacus, because the 
Answer: abacus was slower for her.

Problem: How does the sentence end?

The ceiling in my house was better than the roof on Johns because the 
Answer: ceiling was perfect.

Problem: How does the sentence end?

In art class Samuel learned how to weave quickly but Kyle had some difficulty as 
Answer: Kyle likes outdoor works.

Problem: How does the sentence end?

Katrina managed to stop smoking but Betty did not because 
Answer:
Katrina was dedicated to it.