Then, for some reason--we will probably never know precisely why--the era of trilobites, triceratops, and other multicellular creatures commenced.
For reasons we will probably never understand, the era of these creatures commenced.
For obvious reasons, we know exactly why the era of triceratops, trilobites, and other creatures commenced.
The story forecasts about workers and their jobs.
Someone is using tobacco on the train.
I often watch things I record.
A man is driving.
Three psychologists worked with babies to test a hypothesis.
There is only one museum to visit near the Grand Canal.