[Q]: How does the sentence end?

Maria showed Cynthia how to clean their engine since

[A]: Maria had extensive knowledge about cars and trucks.

[Q]: How does the sentence end?

Derrick has a more positive outlook on life than Dennis does because

[A]: Derrick journals and meditates.

[Q]: How does the sentence end?

The wine bottle that I bought from the local store won't fit in the holder because the

[A]:
wine is too heavy.