Choose the word or phrase among A, B, C or D that best fits the blank space in the following passage.

Neil Armstrong was the first person (1)…….. on the moon. He was born in Ohio on August 5, 1930. While he was in college, he left to serve in the U.S. Navy. He flew planes during the Korean War. Then he came back to college and finished the degree he (2)……... He later (3)…….. a master's degree too.

Armstrong became an astronaut in 1962. He was the commander of Gemini 8 in 1966. Neil Armstrong (4)…….. the first successful connection of two vehicles in space.

Armstrong’s second flight was Apollo 11 in 1969, and he was the mission commander. He flew with Buzz Aldrin and Michael Collins. Armstrong and Aldrin landed on the moon in a lunar module named "Eagle". With more than half a billion people (5)…….. on television, Armstrong (6)……… the ladder and said, "That's one small step for a man, one giant leap for mankind." and Aldrin (7)……. him shortly. They explored the surface for two and a half hours, collecting samples and taking photographs.

They left behind an American flag, and a plaque reading, "Here men from the planet Earth first (8)………..upon the moon. July 1969 A.D. We came in (9)…….for all mankind."

After almost a day, they blasted off. They docked with Collins in (10)……….around the noon. All three then flew back to the Earth.

(1) ...............

• A. 
  walk
• B. 
  walking
• C. 
  to walk
• D. 
  walked