Problem: How does the sentence end?

Donald's car started, but Nelson's car did not, because 
Answer: Donald put his spark plugs in correctly.

Problem: How does the sentence end?

So 
Answer: Laura did not show for class because Laura had to deal with some problem, while Angela was fine.

Problem: How does the sentence end?

Derrick's Spanish speaking is native, while Craig can't speak it. 
Answer: Derrick lives in Mexico City.

Problem: How does the sentence end?

I think it's fun to use a sponge to paint walls instead of a paintbrush as the 
Answer:
paintbrush has no special effect.