Please capitalize where necessary: and oman has undergone a tremendous change since it became independent of great britain. until the coup of 1970 oman was a closed country with a medieval government and extreme poverty.
A: And Oman has undergone a tremendous change since it became independent of Great Britain. Until the coup of 1970 Oman was a closed country with a medieval government and extreme poverty.

Please capitalize where necessary: one thing is certain.
A: One thing is certain.

Please capitalize where necessary: chauvenet continued to press for a four year academic course, and the naval school was reorganized in 1850-1851 as the u.s. naval academy, with a course of study of four consecutive years.
A: Chauvenet continued to press for a four year academic course, and the Naval School was reorganized in 1850-1851 as the U.S. Naval Academy, with a course of study of four consecutive years.

Please capitalize where necessary: the book is about seven young people: ellie, corrie, fi, homer, robyn, kevin and lee heads out to camp in the bush for a few days. at night, the plane flying fast and low over them.
A:
The book is about seven young people: Ellie, Corrie, Fi, Homer, Robyn, Kevin and Lee heads out to camp in the bush for a few days. At night, the plane flying fast and low over them.