Premise: Recent Changes in U.S.

Hypothesis: They were unexpected changes.
Answer: it is not possible to tell

Premise: Every American has been in a car crash.

Hypothesis: Each American has been in at least one car crash.
Answer: yes

Premise: Bill Didn't Inhale Clinton, Newt Gingrich, and Al Gore have all admitted to having tried drugs in their early days.

Hypothesis: Every one of them has admitted to having tried drugs, since when they were young it was common.
Answer: it is not possible to tell

Premise: Situated on a hill overlooking the Loire, the town itself invites the visitor to linger in the narrow winding streets that lead from the cathedral to the chateau, pausing to admire the handsome old houses on the Place Saint-Louis and the Rue Porte-Chartraine.

Hypothesis: The town is in the middle of a valley.
Answer: no