[Q]: How does the sentence end?

Escaping was a lot easier for Lindsey than Natalie because

[A]: Lindsey knew exactly which passage to go through.

[Q]: How does the sentence end?

The man became more confident by reading a book, not by reading the magazine. That's because the

[A]: book was more helpful.

[Q]: How does the sentence end?

Robert asked Brian if he knows how to tie a windsor knot, because

[A]:
Robert had forgotten.