What did he say ________ his stupid behavior– He admitted having made a serious mistake

Before a problem can be solved，it must be obvious____the problem itself is.

Large quantities of polluted water_____ into the sea so that lots of fish died.

I’m terribly sorry. I’m late because ….— That’s OK. You are here and that’s what _____.

e of trouble, although I feel disappointed aboutwhere I am, I still think _______ about where I am going.