He is being criticized as a loudmouth.

He said nothing, just made a sound.

He said it under his breath, suppressing his anger.

Coenzyme is a substance necessary to assist chemical reactions in the body.

His high-pitched voice echoed throughout the room.

He raised his voice in anger.

I went to see a movie by myself.

Watching a movie alone is enjoyable.

He started reading a book, then suddenly the phone rang.

The play was suspended.