故障排除技巧：如果工具箱冻结运行或者无法响应，那么要立刻使用工具箱右上角的 “X” 按钮退出。
Troubleshooting tip: If the toolkit freezes or becomes non-responsive at any point, do not hesitate to shut it down using the "X" in the top right corner of the toolkit.
屏幕会冻结，一条消息告诉您考试已经结束，您将看到与您自己单击Done按钮时相同的是否通过的消息。
The screen freezes, a message tells you the exam has ended, and you'll see the same pass or fail message you would if you had clicked the Done button yourself. Oops!
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