the museum of copenhagen is at vesterbrogade 59, 1620 københavn v. and introduces the visitor to the city's history, past and present.

How would the previous sentence be correctly capitalized?
Answer: The Museum of Copenhagen is at Vesterbrogade 59, 1620 København V. and introduces the visitor to the city's history, past and present.
this has for instance been done by two american scientists, who have supplied the following pictures to fysikbasen:

How would the previous sentence be correctly capitalized?
Answer: This has for instance been done by two American scientists, who have supplied the following pictures to Fysikbasen:
pretzels without gluten, no wheat. 60 grams. brand: dr. schär.

How would the previous sentence be correctly capitalized?
Answer: Pretzels without gluten, no wheat. 60 grams. Brand: Dr. Schär.
as you progress you can ...

How would the previous sentence be correctly capitalized?
Answer: As you progress you can ...