Alternatives to 'if'

We must be on time for our class, _____________ the teacher won't let us in.

Choose the correct option: Good luck doesn't exist provided that/otherwise/unless you make it.

_______ I not booked the ticket in advance, I wouldn't have been able to get to the concert

You'll get a high mark _____________ that you study.

Choose the correct option: I wouldn't have bought a black cat had/unless/provided I not believed they bring good luck.

Make the sentence! I / lend you money / you / give it back? (suppose)

____________ you broke a mirror, would you assume you'll get bad luck?

Had/Should/Unless you  see him, tell him to call me back.

You'll get better at dancing ________________ you practice

Make the sentence: I / not connect / my internet / come back (unless)