His face looked very serious.

When I looked at his face, I felt something was wrong.

When I hear that song, old memories come to mind.

When I heard his name, his smile immediately came to mind.

They (referring to women or girls) are my best friends.

He couldn't control his five passions, and his anger exploded.

His dog has entered the mating season.

His dog started to go into heat yesterday.

His voice was filled with deep sadness.

People who are not well-informed find it difficult to use internet information appropriately.