He did his best to carry out the duty.

At the school sports festival, we did a three-legged race.

He was born and raised in Leningrad.

The carbonyl group plays an important role in organic chemistry.

She is good at making clay dolls.

This mannequin is very realistic, it looks like a real person.

I use whitening toothpaste every day.

Methionine is one of the essential amino acids that cannot be synthesized in the human body.

I started packing for the trip.

That person is my friend.