очень
In 1) ……….. early 1940s, pilots flying at 2) ……….. night frequently reported 3) ……….. strange phenomenon: strange fireballs that followed their planes at high speeds.
American forces called 4) ……….. fireballs ‘foo fighters’.
Pilots during 5) ……….. World War II reported seeing them over 6) ……….. Germany, 7) ……….. Italy and 8) ……….. Pacific Ocean. They were commonly believed to be 9) ……….. new technology development by 10) ……….. German scientists, but even 11) ……….. newest technologies of the time couldn’t really explain what these fireballs were. In fact, foo fighters remain 12) ……….. unsolved mystery to this day.

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