Premise:
"While GAO's primary client is the Congress, we seek to maintain constructive working relationships with the executive branch; conduct our work in a professional, objective, and nonpartisan manner; and help improve government."
Hypothesis: GAO's biggest client is Congress, comprising of 75% of their business.

it is not possible to tell

Premise:
"At Portela (662 m/2,172 ft), the views of the coast are striking."
Hypothesis: There are great views of the coast at Portela.

yes

Premise:
"below, HCFA addressed comments on various elements of the proposed rule throughout the preamble to the final rule."
Hypothesis: The HCFA had no comments on the proposed rule.
no