Yes "it" may be used in all those constructions and others, but soem of your illustrations could use changes. When I see a colleague of mine composing such a phrase, I ordinarily indicate that it's a form of previous-fashioned affected valediction which, likely, presently, a native English speaker wouldn't generate. https://socialbraintech.com/story5250585/details-fiction-and-best-aquarium-shops-dubai