You can't be more stupid! How could you let such a golden opportunity to make big money slip through your fingers? It was an opportunity that comes once in a blue moon.

你真蠢！这样一个发大财的机会千载难逢，你怎能眼睁睁的让他跑掉那？

18.抓住机会 jump at the chance

You should have jump at such a good chance.

这样的好机会，你应该抓住。