He fastened the buckle of his belt.

He publicly acknowledged that he is bisexual.

The pilot ensures the safe operation of the airplane.

His child is suffering from rickets.

My favorite dessert is caramel pudding.

The bark of the cork tree is often used as a wine stopper.

He underwent a bone marrow transplant surgery.

He plays a central role in this project.

He is a fervent communist.

This phenomenon occurs cyclically.