Please complete this fill-in-the-blank text.

One part is important.

I like reading uncle's composition.

The calculus of variations is a branch of mathematics that deals with the optimization of functions.

In this company, being late is not allowed as an unwritten rule.

He wrote a poem using the four treasures of the study.

The cultural festival will be held at our school next week.

He has a deep interest in the European cultural sphere.

He is my sworn elder brother, always protecting me.

My pet Java sparrow is very cute.