Please capitalize where necessary: sofia is one of the oldest cities of europe clashed here influences of east and west and left after a lot of memorabilia old orthodox boyana church arouses admiration of tourists.
A: Sofia is one of the oldest cities of Europe clashed here influences of East and West and left after a lot of memorabilia Old Orthodox Boyana Church arouses admiration of tourists.

Please capitalize where necessary: the hamsun days in lom and grimstad are hardly over and the next hamsun event is comning up.
A: The Hamsun days in Lom and Grimstad are hardly over and the next Hamsun event is comning up.

Please capitalize where necessary: this helps the world wide web community because as website owners we'll receive less spam.
A: This helps the world wide web community because as website owners we'll receive less spam.

Please capitalize where necessary: therefore it is recommended to supply oxygen in the form of air, either through bioventing or air sparging or a combination of the two.
A:
Therefore it is recommended to supply oxygen in the form of air, either through bioventing or air sparging or a combination of the two.