[Q]: How does the sentence end?

The body of Katrina was more worn down than Sarah because

[A]: Katrina had a hard life.

[Q]: How does the sentence end?

The dough that Steven is making won't rise, so Michael shows him how to do it, so

[A]: Michael is experienced at baking.

[Q]: How does the sentence end?

Charlie decided to quit smoking so he threw away his carton but not his lighter because the

[A]:
carton wasn't a gift.