Read the text again. Find and underline examples of verbs in the past simple.
Giải thích
Was (thì, là), went (đã đi), researched (đã nghiên cứu), introduced (đã giới thiệu), received (đã nhận)
Was (thì, là), went (đã đi), researched (đã nghiên cứu), introduced (đã giới thiệu), received (đã nhận)