Secondary school in the US usually covers seven years ,grades six to twelve

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• secondary school in the US usually covers seven years,grades six to twelve 这句子里 cover 为什么要加s变 covers?
• Secondary school in the US usually covers seven years ,grades six to twelve
• Secondary school in the US usually covers seven years ,grades six to twelve
• secondary school in the US usually covers seven years,grades six to twelve 这句子里 cover 为什么要加s变 covers?还有 light travels faster than sound 那个travel为什么要加s?
• 英语翻译A Letter from a Senior High Student Dear Li Kang,How's it going?I thought I'd write to tell you about the American school system.Secondary school in the US usually covers seven years,grades six to twelve.Ninth to twelfth grades are high school.At the end of twelfth grade,American students receive the high school diploma.Students need a high school diploma if they want to go to college.The school year is divided into two semesters,the first of whic
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