Strike while the iron is hot.
Plenty of opportunities will present themselves, if only you are awake to them.
She made nothing of her opportunities.
Don't hesitate to take the opportunity to propose to her.
They watched their chance.
They missed a good chance.
I took advantage of an opportunity.
I availed myself of this favorable opportunity.
We make the most of the opportunity.
We made the most of the opportunity.
We made the most of the opportunity.
The time is ripe for a drastic reform.
This is a golden opportunity we'd be stupid to pass up. Let's get to work and finish it all in one fell swoop.
Make hay while the sun shines.
Strike while the iron is hot.
Don't throw away a good opportunity.
Opportunity seldom knocks twice.
Opportunity seldom knocks twice.
Your success will largely depend upon how you will make good use of your opportunity.
Unless you make a decision quickly, the opportunity will be lost.