The claim that the Titanic never sank but was swapped with a damaged sister ship __________ (consider) a conspiracy theory. a) might have been b) must have been c) can't have been
a) might have been considered
The "moon landing hoax" theory __________ (spread) by misinformation, despite overwhelming evidence proving the landings were real.
may have been / might have been spread
The pyramids of Egypt __________ (build) using advanced engineering techniques, but the exact methods remain unknown.
must have been built
The identity of Jack the Ripper __________ (hide) by the killer himself. a) must have been b) could have been c) can't have been
b) could have been hidden
The idea that vaccines cause autism __________ (disprove) many times, yet some people still believe it.
must have been dispproved
The idea that the Earth was the center of the universe __________ (challenge) by scientists for centuries before being proven false.
must have been challenged
The "Bermuda Triangle" mystery __________ (exaggerate) by media and myths over time, leading to numerous conspiracy theories.
may have been / might have been exaggerated
The disappearance of Amelia Earhart __________ (explain) in many ways, including theories of survival, espionage, or simply a crash at sea.
might have been / could have been explained
Crop circles __________ (make) by extraterrestrials, according to some believers. a) may have been b) must have been c) can't have been
b) could have been made