"Scientists supposed that large dinosaurs lived in swamps"
"We were speculating whether the President had to resign after the scandal"
"I mulled over the events of the afternoon"
"philosophers have speculated on the question of God for thousands of years"
"The scientist must stop to observe and start to excogitate"
"I bought this house not because I want to live in it but to sell it later at a good price, so I am speculating"
Some physicists have speculated that in nature all particles may be colorless.
It was a quiet evening and Tom was speculating about the origin of the universe.
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