Have you ever seen a firefly in the park?

Hotaru is my best friend, she is always bright and energetic.

The firefly is glowing in the darkness.

I love scallops.

On a summer night, the light of the fireflies illuminated the surface of the river.

The scallop dishes at this restaurant are exquisite.

What is the complement of this sentence?

Health and physical education class is my favorite time.

The complement system of the immune system plays an important role in eliminating foreign substances in the body.

He was able to gain confidence by passing that exam.