IN: Write the next sentence in this paragraph:
How to heat and apply solder
Cut, file, sand or otherwise flatten the joining surfaces as much as possible.
However don't overly polish the surfaces as a slightly rough or' keyed' surface usually leads to a stronger bond. It is crucially important in any soldering task to ensure that the pieces to be joined match up closely with the smallest gap possible.

OUT: Wash the pieces clean and if possible' pickle' them. Pickling means immersing the pieces or covering the joint area in an acid cleaning fluid.

IN: Write the next sentence in this paragraph:
How to treat ocular rosacea
Visit your doctor.
If you believe you are experiencing ocular rosacea, it is best to consult your doctor. Your eye doctor or general practitioner is the best person to diagnose and treat ocular rosacea.

OUT: Severe or untreated problems can lead to scarring on the eyelid or corneal abrasions, both of which can impact your vision. That is why it is best to talk to a doctor when you first notice early symptoms.

IN: Write the next sentence in this paragraph:
How to lead climb indoors
Check with your local climbing gym about their lead climbing policy.
Most climbing gyms require you to have a lead card or certification, but the specifics of how they carry this out vary between facilities. In particular :
Most gyms offer lead climbing classes to educate the beginner.

OUT:
But you might need to be able to climb at a certain level, or have certain gear, before joining the class. If you're already an experienced climber, ask if you can demonstrate your lead climbing ability without having to take the entire class.