Premise:
"With two 30-story towers, this is largest of Sheraton's four Waikiki beachfront hotels, with the most services and room options."
Hypothesis: Sheraton plans on building another tower in Waikiki.

it is not possible to tell

Premise:
"Two Watergate vets Charles W. Colson says impeach him; John Dean says don't, because Congress has been too partisan and unfair."
Hypothesis: John Dean doesn't want an impeachment.

yes

Premise:
"However, with very short notice, it is sometimes difficult to move the manpower to the site in the short time desired."
Hypothesis: It is at times hard to move manpower to the site in a very short time limit.
yes