[Q]: How does the sentence end?

Erin cook for Laura all the time, because

[A]: Laura is such a great food eater.

[Q]: How does the sentence end?

Bob went to the vehicle dealer to trade his truck for a motorcycle, because the

[A]: motorcycle was new.

[Q]: How does the sentence end?

The teens of Rachel are better behaved than the ones Mary has because

[A]:
Mary is more laid back.