input question: To seal leather to a keyring, you can

output answer: Seal it in krazy glue

input question: How to store DVDs without using any shelving?

output answer: Remove the DVDs from the box and store them in some CD sleeves

input question: How can you tell if a sink hole has stopped growing and can be filled?

output answer:
Take a pole or stick and probe around in the sinkhole. Note how deep and wide it is. Do this daily until the measurements stop changing.