If there is a hell on earth, it may just be these find-the-mistake exercises from the Advanced HSK. These questions are real killers: instead of picking the most suitable missing word, you have to identify which section of a brief passage contains a problem with grammar or word choice. Sound easy? Today we bring you fifteen of these nasty, nasty questions. So if you think your Chinese is good put yourself to the test. We'll see you on the other side.