significant numbers of slaves probably also provided a proportion of the manpower for the great building projects of the viking age.

How would the previous sentence be correctly capitalized?
Answer: Significant numbers of slaves probably also provided a proportion of the manpower for the great building projects of the Viking Age.
the european parliament and brussels luxembourg train station are 100 metres away.

How would the previous sentence be correctly capitalized?
Answer: The European Parliament and Brussels Luxembourg Train Station are 100 metres away.
the rock formations start at around 5 meters and go down to about 32 meters.

How would the previous sentence be correctly capitalized?
Answer: The rock formations start at around 5 meters and go down to about 32 meters.
the children were very enthusiastic about the possibilities of using their own cell phones as an educational tool.

How would the previous sentence be correctly capitalized?
Answer: The children were very enthusiastic about the possibilities of using their own cell phones as an educational tool.