This book has a page absence, so it's difficult to read.

Since we have completed the first step of this project, let's take a short break.

We finished up the first stage of the project.

The building collapsed due to aging.

The old building finally collapsed.

What does the constructor of this class do?

His life followed a path of downfall.

His company fell into ruin due to the economic crisis.

He experienced an economic fall.

He tumbled down the stairs.