input question: To firmly set pieces of PVC joined together by elbow joints.

output answer: Use a mallet to hammer the PVC into the joints.

input question: How can I open a stuck screw on lid?

output answer: Running hot water over the lid for a minute or two, wipe down, and then open. You can also soak the lid in hot water to get a similar effect.

input question: To melt sugar in a sauce pan,

output answer:
stir the sugar constantly with a spoon over medium-high heat in a pan.