He is working round the clock.

This regular tetrahedron is composed of equilateral triangles on all sides.

We visited various places.

He bought six apples.

He is interested in the shape of a polyhedron.

This hexagonal object is very beautiful.

The rainy season begins in Japan in June.

She called him by his name.

He is called the smartest in the class.

He often gets treated to dinner by his friends.