· 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/