Answer:
1. What are the Two main reasons the Roman Empire fell?
•Invasion of Barbarian Tribes.
•Government Corruption and Political Instability.
2. What are the Two main reasons the Han Dynasty fell?
•Bad rulers.
•The influence of empresses and court eunuchs over child emperors too young to rule by themselves.
3. What are the Two main reasons the Gupta Empire fell?
•The Gupta empire was continuously attacked by Huns.
•Dynastic Dissensions And Weak Rulers.
Hope this helps...... :)