試題：
Your class are about to set off for the three-day tour, for which you have saved money and planned for the past two years. It is almost an hour past the scheduled departure time, but two of your classmates, who are always late for everything, have not showed up and you cannot get in touch with them by phone for the moment. Should your class start your journey right away without the two classmates, or should your class wait until they show up? Please provide reasons to explain and support your viewpoints.
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