Learn Chinese using Coursera platform
https://www.coursera.org/learn/learn-chinese/
https://www.coursera.org/learn/learn-chinese/
https://www.ilc.cuhk.edu.hk/Chinese/plw/intro/ch1/ch1.html
中英對照香港學校中文學習基礎字詞
Lexical Items with English Explanations for fundamental Chinese learning in Hong Kong schools
http://www.beijingputonghua.com/psc/ldzp/ldzp.htm
http://www.putonghuaweb.com/pthexercise.htm