He was singing to himself alone in the room.

Unable to bear the pain, he had no choice but to scream.

This coastline is protected by wave-dissipating blocks.

This filter helps to improve the sound quality.

He was plucking flowers in the garden.

I saw a flock of sheep on the top of the mountain.

He was wrapping the present.

Interracial marriage promotes diversity and understanding.

Intermolecular forces are an important factor in determining the properties of a substance.

He is doing special exercises to strengthen the interosseous muscles of his hand.