I like English very much, so I choose it as my _____.
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Jack had a bad cold, so he didn't _____ the class yesterday.
You have to _____ yourself. You are not a child any more.
You must _____ before you read artivles on our website.
顶级域名edu代表（）。
A. 教育机构
B. 商业机构
C. 政府部门
D. 国家代码
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