1. The English Department, School of Foreign Languages and Literatures, Lanzhou University, Lanzhou, People’s Republic of China
2. Lanzhou No. 33 Middle School, Lanzhou, People’s Republic of China
3. The Tibetan Middle School of Hezuo, Hezuo, People’s Republic of China
4. College of Languages and Culture, Xinjiang Medical University, Urumqi, People’s Republic of China