Sentence 1: Some had torn themselves open.

Sentence 2: They remained closed.
Is this second sentence entailed by the first?

Answer: no

Sentence 1: The sturdy edifices resisted total destruction and are still dominated by Notre-Dame's two soaring square towers, minus their original spires.

Sentence 2: Notre-Dame is the tallest chapel in the city.
Is this second sentence entailed by the first?

Answer: it is not possible to tell

Sentence 1: A pair of inventing brothers is building a Model-T for the air--a $179,400 plane with simplified controls and a giant parachute for safer crash landings.

Sentence 2: While the proposed Model-T for the air would have simpler controls, it doesn't have any measures to make the airplane safer.
Is this second sentence entailed by the first?

Answer:
no