Otherwise?

A few days ago I was asked how to use the words otherwise, and I noticed that I hardly ever use it myself. So I was thinking about a quick and easy way to explain it and to compare it with similar transition words. And with the help of the AI of my choice I came up with the following:
Otherwise — Used to explain what will happen if you don't do something.
Or / Or else — Similar to otherwise, used in simple instructions.
If ... not / Unless — Used to set a condition.
So — Used to state a result.
So how about a little exercise?
Choose the best word from the box: [ otherwise / unless / so / or ] and fill in the blanks!
Hurry up, ________ you will be late for the school bus!
You must study hard for the test; ________, you won't get a good score.
It started to rain heavily, ________ our baseball practice was canceled.
We cannot enter the science lab ________ the teacher is inside.
Set your alarm clock tonight; ________, you might oversleep tomorrow morning.
Well, how are you doing? I will give you a little time to think and come up with the answer tomorrow. I am sure you will have it all right!
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Otherwise as the 'or else this happens' word is a neat way to frame it, that little fill-in exercise is a good test.