Read the text and fill in the gaps with the right phrases.

Frank: We had ... yesterday. We discussed different ... .
Chris: No wonder. They are the most important problems these days.
Frank: I think many people understand they should ... .
Chris: Do they really understand that? I’m not quite sure, because factories ... into rivers, air pollution ... too.
Frank: That’s true. And yet more and more people fight against ... , nuclear weapons and other things.
Chris: But will they win? And when will they win these battles?
Frank: Don’t lose hope. Let’s hope for the best.