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1.Internet 2.platform 3.social media 4.app
1.registered member 2.mail
1.advanced course & certificate 2.investors
1.online course 2.a variety of subjects 3.community 4.course certification 5.interactivity 6.work on your own schedule
1.university 2.college 3.enterprise 4.government
1.over 13 years old 2.students 3.beginners 4.studying abroad 5.business 6.master something
1.top professors 2.high quality Electronic textbook
1.free course
1.maintenance fee 2.salary 3.design course