Text: estonia's main export partners are sweden, finland and russia, while its main import partners are finland, germany and sweden.

Correct capitalization: Estonia's main export partners are Sweden, Finland and Russia, while its main import partners are Finland, Germany and Sweden.

Text: to say he retired needs of course to be qualified with the remark that throughout his life he never held any paid scientific post.

Correct capitalization: To say he retired needs of course to be qualified with the remark that throughout his life he never held any paid scientific post.

Text: he ran for congress in 1888 and was elected but failed to be reelected in 1890.

Correct capitalization: He ran for Congress in 1888 and was elected but failed to be reelected in 1890.

Text: instructions: mouse to select options.

Correct capitalization:
Instructions: Mouse to select options.