One way to remove bad luck in Engpsh is to say "touch wood" or "knock on wood". This is a superstition that originated in Europe and is meant to protect a person from bad luck. For example, you could say "I hope I don't fail the exam" and then follow it with "touch wood" to prevent bad luck. In Chinese, you could say "我希望我不会考试不及格" followed by "触摸木头" to prevent bad luck.