He was watching her movements attentively.

He apologized from the bottom of his heart.

He swore loyalty to his country.

This building is located in the center of the city.

His room is decorated with colorful abstract paintings.

The content of his art work expresses his own emotions and experiences.

My dog recently contracted strongylosis.

He is traveling around the world as an ecologist.

We must strive to protect the natural environment.

We should recycle to prevent environmental pollution.