IN 1952, THERE WERE MORE THAN 1,500 UFO SIGHTINGS _______ THE WORLD...

8. - BÀI SOẠN TRAC NGHIEM-TA9- UNIT 10
BÀI SOẠN TRAC NGHIEM-TA9- UNIT 10

8. In 1952, there were more than 1,500 UFO sightings _______ the world.

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