题目内容
调试是为了让程序执行到某行代码时停顿，我们需要在这一行设置（ ）。
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One guide should continue to take tourists to travel while the other looks for the missing tourist if two guides travel with the tour group.
It is recommended that the guide should tell tourists about the places of interests and meal time before they travel.
During the time for free sightseeing the guide should allow tourists to go wherever they like.
It is up to tourists where they stay in the hotel or travel to a place where few people have been.
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