Problem: How does the next paragraph end?

How to whelp large breed dogs
Prepare the whelping box.
The whelping box is the space in which your dog gives birth to its puppies. It is also the space to which all puppies should return after their mother has completed birthing its litter.
A: You can buy a whelping box commercially or construct one from wood or a cardboard box. If you think your dog will become pregnant again, you might as well invest in a sturdier commercially-made whelping box.

Problem: How does the next paragraph end?

He spins the wheel of the tire. He takes the tire off the bike and lays it against the building. he
A: uses a tool to fix the spoke of the tire.

Problem: How does the next paragraph end?

A man walks into a room playing his bagpipes. he
A: stops playing his bagpipes.

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How to know if you need new glasses
See your optometrist about frequent headaches.
Many people's vision slowly changes over time. Essentially, your eyes and brain will be straining to correct your vision if they need more assistance than your glasses provide, leading to fatigue and discomfort.
A:
As such, even slight changes in your vision can lead to headaches if you don't keep your prescription up to date. If you notice a gradual increase in the frequency of headaches you experience, schedule an eye exam with your optometrist to determine whether your vision is the cause.