Wish you good luck with these ‘luck’ expressions:
Twist of fate
A change in a sequence of events.
By a twist of fate, they met again in New York.
A stroke of good luck
Something good that happens when you least expect it.
I opened the book on exactly the same page by a stroke of good luck.
An excellent opportunity that is unlikely to be repeated.
This is a golden opportunity we must appreciate.
Jump at the chance
To quickly and unexpectedly get a lucky opportunity.
When the band singer became ill, Bob jumped at the chance and became famous.
Cross your fingers! (Keep your fingers crossed!)
Hoping the things will happen the way we want them to.
I’m having a driving test in the morning so cross your fingers.
Happening by chance.
I didn’t know the answer. It was just a lucky guess.