He wrote a sentence using a pronoun.

Learning Modern English is important for smooth international communication.

His first adjective is 'beautiful'.

Could you attend the meeting on my behalf?

Rino is my best friend.

His actions change depending on the circumstances.

My grandfather studied medicine at the Imperial University.

The Neolithic was an important period in human history.

They used Euclid's algorithm to find the greatest common divisor.

Please teach me how to find the greatest common divisor.