Problem: How does the next paragraph end?

How to get vitamin d naturally
Learn how the sun creates vitamin d.
Sunlight is a form of radiation that has two forms, ultraviolet a (uva) and ultraviolet b (uvb) radiation. Your main source of vitamin d occurs when uvb radiation strikes your skin. When this happens, the first steps of vitamin d synthesis in your body is triggered.
A: After this, the next steps occur in the liver and then the kidneys. Because the rest takes place inside the body, once the body is triggered, you no longer need to be exposed to uvb radiation.

Problem: How does the next paragraph end?

How to get your parents to let you date someone
Speak to them honestly about dating.
The first thing to do is to talk to your parents about dating, and be honest and receptive during the talk. Never start this conversation after a fight, or after they tell you that you can't date.
A: You want to get their position on the issue, and their level of opposition to dating. Bring it up at a random time so they won't become suspicious of your questions.

Problem: How does the next paragraph end?

How to make your own speakers
Find copper wire, packing tape, and a strong magnet.
While there is a lot of calibrating that goes into high end speakers, the basic technology is actually pretty simple. An electrical current is run through a wire that is attached to a magnet.
A: This current makes the magnet vibrate, and those vibrations are picked up by our ears as sound. To hear the sound well you should also get a small plastic tupperware or cup.

Problem: How does the next paragraph end?

How to install mail slots in doors
Purchase your mail slot.
Buy the largest one that will fit on your door to accommodate larger envelopes and magazines. Another good idea is buying one with a basket to catch the mail as it comes through the door slot rather than allowing it to scatter across your entryway.
A:
Stand in front of your door and determine the best height in which to install the mail slot. Make a pencil mark at that height to use when you begin laying out the template.