He was always faithful to his friends.

He pioneered a new realm.

He is good at speaking Chinese.

He is my faithful servant, always carrying out my orders.

A centralized political system is one in which all power is concentrated in the central government.

I can't forget the taste when I first ate borscht.

She used to be my wet nurse.

He gave me good advice.

He advised me to continue studying.

This stratum is thought to be millions of years old.