What class of ticket would you like，（）class or business class? 那你需要定什么舱位的机票（经济舱还是商务舱）？

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• Fan is standing in front of his class.
• My cousin（）at the top of his class last year.
• The class is （） because of the storm.
• class文件和exe文件都是可执行文件。（）
• 字节码的扩展名是.class。（）