[Q]: How does the sentence end?

Homework was easy for the smart Laura but not for Jessica as

[A]: Jessica was very stupid.

[Q]: How does the sentence end?

Prevent motion sickness was understandable to Mary but not to Patricia because

[A]: Mary was often motion sick as a youngster.

[Q]: How does the sentence end?

Katrina was better suited at doing research than Sarah because

[A]:
Katrina enjoyed spending long hours in the library.