Although stories about aliens have never been officially confirmed, their existence has been widely speculated upon.
Many people believe that __(31)__ from outer space have visited us for centuries. Some say that life on Earth __(32)__ “out there” and was seeded here. Others say that aliens have __(33)__ what happens on Earth, and are responsible for quite a few legends, and that the ancient Greek and Roman gods, __(34)__ the fairies and dwarfs in many classical tales, were in fact “space people” living here. Still __(35)__ say that aliens were responsible for the growth of highly evolved civilizations which have __(36)__ perished, including the Incan and Mayan civilizations and the legendary Atlantis.
A lot of ancient civilizations, __(37)__ the Egyptians, Hindus, Greeks, and Mayans, have left writings and __(38)__ which indicate contacts with superior beings “from the stars.” Many believe that the aliens are here to help us, while others hold that the aliens intend us __(39)__. Still others think that most aliens visit Earth to study us like our scientists study primitive natives and animals, and have no interest in helping us __(40)__.
It is difficult to comment conclusively on these theories in general, apart from saying that any and all of them might be possible. Maybe time will tell.
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