He is working on his job with intense concentration.

He is an expert in electronic phototypesetting.

He is creating a newspaper using an electronic phototypesetter.

Santa Claus delivers presents to children.

He drew a triangle on the blackboard.

I am planning to go to San Francisco next week.

She gave birth to a baby in the maternity hospital.

My younger brother is good at addition in arithmetic.

This silkworm produces beautiful silk.

This lemon is sour.