Вставить предлоги где они необходимы.

1. He was born ….. Rīga, Latvia, and educated ….. the University of Dorpat.
2. Ostwald is especially known ….. his contributions ….. the field …..
electrochemistry.
3. ….. 1900 he discovered a method ….. preparing nitric acid ….. oxidizing
ammonia.
4. The Ostwald process was used ….. Germany ….. World War I …..
manufacturing explosives.
5. Deuterium has become important as a chemical tracer, ….. thermonuclear
weapons, and ….. fusion power research.