I set Sort by Last Post Time with order Descending, but the latest news not yet replied supposed to be showned first, but it's not. Instead, it's somewhere in another page in the middle. That means Last Thread with no reply has lower priority than the thread with latest comment, doesn't it? Is it supposed to be like that?
So I try again with Sort by Thread Start Time with order Descending, and now the same latest news not yet replied is shown first, followed by other threads sort by time, descending. It's exactly what I want. I'm happy now! Thanks a lot for your help, thincom2000!