Sentence 1: South of Penrith is an area of farmland that forms the eastern boundary of the National Park.

Sentence 2: Since it is adjacent to the National Park, there is little concern over it ever getting built up.
Is this second sentence entailed by the first?

Answer: it is not possible to tell

Sentence 1: In Justice Department briefs and in private meetings, the Secret Service insisted that the failure to recognize the would result in profound and predictable peril to the president, could mean the difference between life or death, would endanger the integrity of our national security, etc.

Sentence 2: All Justice Department briefs and private meetings were attended by Secret Service.
Is this second sentence entailed by the first?

Answer: it is not possible to tell

Sentence 1: Hold it while I get my penknife." The unbelievable had happened.

Sentence 2: It couldnt believe it had happened by I had to get my penknife.
Is this second sentence entailed by the first?

Answer:
yes