A UFO is a general term used for any "unidentified flying object" in the sky which cannot be (1) by an observer. Most UFOs remain (2) as so even after they have been investigated. The UFO phenomenon dates back (3) the beginning of recorded history, but UFO sightings have (4) increased since the mid 1940s.
From UFO videos to UFO pictures, stories and other real life (5) , thousands of people from all (6) of life claim to have seen these mysterious aerial phantoms. Many UFO sightings turn out to be nothing at all, mere airplanes, meteors or comets; (7) many sightings have gone unsolved for decades or even centuries.
The term "flying saucer" came into (8) use after American Kenneth Arnold claimed a UFO sighting on June 24, 1947 near Mount Rainier, Washington. Arnold claimed to have seen as many as nine brightly lit objects soaring (9) the sky (10) he estimated
A. cover-all
B. cover-point
C. cover-cap
D. cover-up
A UFO is a general term used for any "unidentified flying object" in the sky which cannot be (1) by an observer. Most UFOs remain (2) as so even after they have been investigated. The UFO phenomenon dates back (3) the beginning of recorded history, but UFO sightings have (4) increased since the mid 1940s.
From UFO videos to UFO pictures, stories and other real life (5) , thousands of people from all (6) of life claim to have seen these mysterious aerial phantoms. Many UFO sightings turn out to be nothing at all, mere airplanes, meteors or comets; (7) many sightings have gone unsolved for decades or even centuries.
The term "flying saucer" came into (8) use after American Kenneth Arnold claimed a UFO sighting on June 24, 1947 near Mount Rainier, Washington. Arnold claimed to have seen as many as nine brightly lit objects soaring (9) the sky (10) he estimated
A. found
B. discerned
C. discovered
D. decided
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