Premise: 8 percent APR Visa card.

Hypothesis: 12 percent APR MasterCard.
Answer: no

Premise: And those who lose all HMO coverage may suffer substantial financial loss.

Hypothesis: Those who lose HMO insurance could benefit financially.
Answer: no

Premise: In the tantalus in the dining-room.

Hypothesis: The tantalus is a space ship.
Answer: it is not possible to tell

Premise: As we went up the stairs, John looked back to the diningroom door, and lowered his voice confidentially: "Look here, what's going to happen when these two meet?" I shook my head helplessly.

Hypothesis: John was concerned what would happen when the two people met.
Answer: yes