Exercise on punctuation - Key

Insert the necessary punctuation marks in the following passage (capitals, commas, hyphens, stops, semi colons, colons, etc):

Professor Arnold Smith, who has spent a lifetime studying prehistoric remains, claims that the bones he unearthed in the Californian Desert last May are those of a man-like creature existing millions of years ago, probably at a time when the Pacific Ocean covered much more of the surface of this part of the American continent. Professor Smith is to give a talk on the subject on BBC television on Monday 4th April in the series "Where did you come from?" This is to be followed by a discussion with members of The Lost Atlantis Society, whose president, Colonel Arthur Stone, contends that California is in fact part of the legendary city, the remainder of which lies hidden under the sea. He is urging the USA government to conduct research into this theory but the project has not been received with much enthusiasm from scientists who say that, if Atlantis ever existed, it is far more likely to be found in the area known as The Bermuda Triangle. In the meantime Steven Hughes, Professor of Antediluvian History at Aberdeen University, has come up with the theory that Atlantis was in reality an area of land joining the east coast of Ireland to Britain and that many of the Scottish islands, notably the Hebrides, provide conclusive evidence that Atlanteans once lived in this area.


Other possibilities:
B.B.C. though this is not very common
Monday, 4th April
"Where Did You Come From?" or Where Did You Come From? italics
Please note that placing a final stop after the question mark is a mistake.

is, in fact, part
U.S.A. though this is not very common
theory, but the project
In the meantime,
was, in reality, an area
Britain, and that