Depending on the sentence, not unless could be the correct form.
This is not correct grammar. The correct way to say this would be "Unless we hurry, we will be late for the show." You would not say anything if you were not going to be late.
It depends what you are saying. For example, it's correct to say this: "Walk in a straight line unless otherwise directed". It is not correct to say something weird like "Well call me unless otherwise you don't want to" or something. But it can be done.
The correct spelling of the correct word is 'adaptation', unless you mean 'adoption.'
Communicating would be to tell the research of what the experiment is going to be unless a hypotheses is correct for an experiment.
"Apologize to her" is correct, unless both of you are apologizing to a third person.
Never, unless you use unproper grammar.
Either is correct , unless of course the doctor has a Phd.
Not unless you add the word "the" between "for" and "last."
unless you have the correct machine, you can not do it correctly.
Unless "the weekends" is a place you can go to, then no, it isn't correct. It is best to say "On the weekends" if you mean the days Saturday & Sunday.
Yes... Unless the correct answer is no... but my guess is always C
It is correct to say "on the planet." This is because we live on the surface of the planet, not inside of it.