Problem: How does the next paragraph end?

How to clean aquarium plants 
Use your fingers. 
Wash your hands thoroughly. Next, gently rub the algae off of plants while the plants are still in the aquarium.
A: Remove any algae that you've rubbed off from the aquarium. Once you have clean plants, maintain their cleanliness on a weekly basis by rubbing the algae off them while they are in the aquarium.

Problem: How does the next paragraph end?

How to be a good leader at school 
Know your strengths. 
Knowing your own strengths and what you care about will help you choose what area of leadership to focus in. Do you love helping people? Consider joining a volunteer organization for the needy.
A: Do you have a passion for writing and enjoy working with a team? Maybe the school newspaper would be a good fit for you. If you're a people person and you'd like to work toward the good of the school community, consider joining the student government.

Problem: How does the next paragraph end?

How to transfer photos from a camera to a kindle fire 
Connect your camera to your computer. 
Plug the usb cable into the camera's usb port. Then plug the larger usb 2.0 end of the cable to a vacant usb slot on your computer.
A: If you're using a usb card reader, remove the memory card from the camera (consult your camera's manual for the card slot's location) then insert the memory card into a compatible slot in a usb card reader. Afterwards, plug the card reader into a vacant usb port on your computer.

Problem: How does the next paragraph end?

How to install an underground dog fence 
Using a pencil and paper, draw a map of your yard. 
Draw where you want the boundaries of your electric fence to be. 
Check your transmitter location.
A:
Be sure that it is at least 3 feet from objects such as water heaters as they may get in the way of receiving a strong signal from the wire. Following the manufacturer's instructions, use the screws and hardware given by the manufacturer to mount the transmitter onto the wall.