question: he called 9–1–1. asked what to do. made sure the medics got there.
Capitalize this past sentence correctly.
A: He called 9–1–1. Asked what to do. Made sure the medics got there.

question: the ocean aquarium at the national aquarium denmark contains 4 million litres of water and hundreds of sea creatures.
Capitalize this past sentence correctly.
A: The Ocean aquarium at the National Aquarium Denmark contains 4 million litres of water and hundreds of sea creatures.

question: today, the mineable deposits of this raw material are estimated to 200-400 years of production at the current rate.
Capitalize this past sentence correctly.
A: Today, the mineable deposits of this raw material are estimated to 200-400 years of production at the current rate.