(2012·山东高考)George returned after the war, only ________ that his wife had left him.

It is reported that Russia uses____ energy as Uklaine.

He has ______ lung cancer for several years and is never _______ pain.

 One way to ________ species under threat of extinction—whatever the cause—is to remove them to zoos or parks and feed them there.

We can no longer ________ to consider water an almost free resource that we can use as much as we like.