[Q]: How does the sentence end?

So

[A]: Kevin was doing nothing because Kevin is lazy while Leslie is a hard working person.

[Q]: How does the sentence end?

After they found a restaurant Felicia ordered 2 burgers with fries while Christine ordered a large coke, because

[A]: Christine was just thirtsty.

[Q]: How does the sentence end?

It was necessary for Benjamin to write a note to remind themselves to do their homework but not for Christopher because

[A]:
Benjamin had a poor memory.