Read the following biography and mark the letter A, B, C and D on your answer sheet to indicate the option that best fits each of the numbered blanks.

PROFESSOR TRAN ĐAI NGHIA: A KEY FIGURE IN VIETNAM'S DEVELOPMENT
Professor Tran Dai Nghia was an important Vietnamese scientist and (1) _______. Born on October 15, 1913, in Quang Tri Province, he is best known (2) _______ his work in military engineering. During the Vietnam War, he (3) _______ develop the country's first homemade weapons and military equipment. His inventions, like improved artillery and rockets, (4) _______ an important part in Vietnam's fight for independence.
In addition to his work in defense, Professor Tran Dai Nghia was a dedicated teacher. He trained many young engineers and scientists (5) _______ later supported to build Vietnam's future. After the war, he continued to share his knowledge and passion for science with students, helping to shape the next generation of Vietnamese leaders.
Professor Tran Dai Nghia is remembered for his (6) _______ to both science and national defense. His work helped Vietnam become stronger, and his legacy continues to inspire people in the country today.