Problem: How does the next paragraph end?

How to improve your posture at work
Adjust your chair height so your forearms line up with your keyboard.
Having to reach up or down with your arms when you're typing is bad for your posture. To have good posture at your desk, raise or lower your chair until your forearms are at the same height as your keyboard when you're typing.
A: Try to form a 90-degree angle with your elbows. Most office chairs have a lever or knob underneath them that you can use to adjust their height.

Problem: How does the next paragraph end?

How to solder
Learn what soldering is.
Put into basic terms, soldering is the process of melting a metal onto other metal components in order to bind them.
Soldering differs from welding.
A: In welding, the component pieces are melted together; in soldering, a softer metal with a lower melting point is used to connect them. Because soldering doesn't melt components, it's useful for more delicate applications, such as electronics work, or plumbing.

Problem: How does the next paragraph end?

A young man is seen looking into the camera holding a toothbrush. the man
A: then begins brushing his teeth in several shots.

Problem: How does the next paragraph end?

A boy in a white shirt jumps off of a bed. Another boy lays down on his stomach. another person
A:
lifts him up and drops him on the bed.