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1.People think the creature walks a gorilla.
The creature .....
2.They think the government found a UFO.
The government ......
3.Experts believe that he didn't see a ghost.
He....
4.They report that natives have spotted Bigfoot.
It .........
5.People say the Loch Ness Monster exists.
The Loch Ness Monster ......

1.People think the creature walks a gorilla.The creature is thought to walk a  gorilla2.They think the government found a UFO.The government is thought to have found a UFO3.Experts believe that he didn't see a ghost.He is believed not to have seen a ghost4.They report that natives have spotted Bigfoot.It is reported that natives to have spotted Bigfoot5.People say the Loch Ness Monster exists.The Loch Ness Monster is said to exist