Answer:
The processing question:
1.sad beacuase your past is never come back again but it's happy because you have a happy memories in school
2.My teacher because she teach me to start a happy studying
3.for me it is both
Explanation:
Answer your unforgettable experience in life like being with your crush or your friend always there for you and what makes it unforgettable like to explain it unforgettable experience
Hope it helps ☺️
