Index fossils are an important clue to indicate a specific geological era.

I like listening to the sound of crickets in the garden.

In this graph theory, it is important to calculate the outdegree of each node.

I was surprised by his sudden appearance.

Suddenly, he appeared in the room.

Managing monthly income and expenses is important for understanding your financial situation.

Every day, he enters and leaves the company.

I have completed my application to the university.

I applied to the university.

He sent me a letter.