[Q]: How does the sentence end?

Before the martial arts master would teach the grasshoppers he gave them uniforms but not belts because the

[A]: belts were unobtainable.

[Q]: How does the sentence end?

The student knew basic math from the book, though he was confused my the problems on the board, because the

[A]: book had basic equations.

[Q]: How does the sentence end?

Donald's car started, but Nelson's car did not, because

[A]:
Nelson put his spark plugs in backwards.