One of the secrets of KTV in China is that you don't have to be good at singing. You just have to be loud. So it helps to have a small repertoire of fallback songs you can belt out whenever the occasion calls for it. And for those of you just starting, we recommend this one. Mumble your way through the first couple of versus before striding into laowai stardom with the chorus.
There are plenty of versions and covers of this song floating around. If you're not in China, you may get better performance from this version hosted on Youtube.