remember that murales have existed since prehistoric times, when the men drew on cave walls, to warn of dangers or to tell stories of everyday life.

How would the previous sentence be correctly capitalized?
Answer: Remember that murales have existed since prehistoric times, when the men drew on cave walls, to warn of dangers or to tell stories of everyday life.
in 2012, the bills the eu will have to pay for this project will amount to some €24million, more than twice as much as in 2011."

How would the previous sentence be correctly capitalized?
Answer: In 2012, the bills the EU will have to pay for this project will amount to some €24million, more than twice as much as in 2011."
i have therefore felt compelled to refer here to christ's own statements about the event that has been called "the second coming of christ".

How would the previous sentence be correctly capitalized?
Answer: I have therefore felt compelled to refer here to Christ's own statements about the event that has been called "the second coming of Christ".
at that time there were not so many places to choose among, since it was quite a new area. when birgit and i returned some 10 years later, we could hardly recognize the surroundings.

How would the previous sentence be correctly capitalized?
Answer: At that time there were not so many places to choose among, since it was quite a new area. When Birgit and I returned some 10 years later, we could hardly recognize the surroundings.