Hamaguchi is my best friend.

Mr. Noguchi is my best friend.

He was waiting for me at the door.

Mr. Koguchi is my best friend.

Mr. Kiguchi is my best friend.

The exit to get off the bus is at the back.

Due to the fire, black smoke was billowing in the sky.

I have been to Yantai.

He threw a smoke bomb to obstruct the enemy's view.

Due to the fire, there was thick smoke everywhere.