He sat in front of the computer for a long time.

His dream is to write a full-length novel.

He voiced his feelings out loud.

He raised his voice in surprise.

Sakumiko is my best friend.

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.