Ответ:
1934:That's when Yuri Gagarin was born.
1955: That's when Yuri Gagarin went to Orenburg Pilot's school.
1960: That's when Yuri Gagarin became a cosmonaut.
1961: That's when Yuri Gagarin flew info space on the Soviet spacecraft Vostok 1 and became the first man in space.
1968: That's when Yuri Gagarin was died.