Нужно в предложения вставить идиомы. 1.what i've done will not let things go back to the way they were.= i've bridges. 2.we'll think about it when in happens. = bridge when we come to it. 3.it's happened now and there's nothing we can do about it. = that's bridge. 4.i need to resolve the argument i had with my best friend.= i bridges.

1. What i've done will not let things go back to the way they were.= I've burnt bridges.
2. We'll think about it when in happens. = We'll  cross bridge when we come to it. 
3. It's happened now and there's nothing we can do about it. = That's a crossed bridge.
4. I need to resolve the argument I had with my best friend.= I need to build bridges.