I think you’ll want to flip this so that “questions” loom over someone. The question causes the uncertainty, so you would say: “During the last two years during COVID-19, a lot of questions about the future of work have been looming over company bosses.” Or, “have been looming over owners of office buildings.”

I love that example! A couple hints for you. Just say, “…because the possibility of being ticketed loomed over us all, making us nervous and uncomfortable.” We don’t really say “reparking,” it would be more common to say, “Finally, we insisted that he move the car to save the evening.”

Ahhh great example! One tiny edit: since “results” is the subject, you need to say the “results of the test loom over the students.” Otherwise perfect!

I think in your example, you’re talking about a bad feeling or a superstition. When we say “loom over” it’s something real, something we know about. For example, like a previous example you wrote, you could say, “A big decision about a promotion was looming over him, so he decided not to take the vacation.” In that sense, he wouldn’t want to pass up that promotion because he’s away. Or, “High gas prices were looming over highway travel this summer, so he decided to stay home.” The higher gas prices threatened summer travel, threatened to make him spend too much, so he didn’t travel.