· https://www.examenglish.com/

· http://www.gre.org

· http://www.britishcouncil.org.cn/english/education/exams/new.htm

· http://www.ielts.org/

· https://toefl.neea.cn/

· http://tem.fltonline.cn/

· http://dictionary.cambridge.org/

· https://www.merriam-webster.com/

· http://www.ipl.org/

· http://classics.mit.edu/