根据短文内容，从方框中选择恰当的单词填空。每个单词只能用一次，每空一词。

after  first  an  rocks  highest  joined  famous  with  pilot  managed

    Neil Armstrong is the first man to walk on the moon. He took his flight at six and received his pilot's license at 16. In 1949, Neil the navy(海军) and served as a . He was chosen to be astronaut in 1962. Four years later, he to join two spacecrafts together in space.

    Then the big day came. On 20th July 1969, he landed Apollo on the Moon together Aldrin. Neil said the words "one small step for man, one giant leap for mankind" on the Moon. They became heroes they returned with many Moon . Neil was presented the Medal of Freedom, the award that a US citizen can receive because of his excellent service.