Not a lot of time, but there was a good team at hand, and opportunity had knocked.

But opportunity is knocking, and it's now time Louisiana schools kick down the door.

Well, girls, it seems to me that opportunity is knocking.

In 1960 Johnny answered the door when opportunity knocked and he formed his own band.

When opportunity knocked, "I pulled away from all the loneliness, the competition, of a solo career."

They also knew that opportunity had knocked but nobody had answered.

Opportunity knocked on their door when Popoy's aunt commissioned them to build her house together.

Finally, wealth, prosperity, development, and opportunities etc. knock at their doors.

Opportunity doesn't only knock on your door it almost batters it down!

Opportunity does not always knock - sometimes, the authors exhort, you have to seize it.