Everybody’s fingerprints are _______, so the police can easily find the thieves if any is left when they’re stealing.

She’s so ______ that no one can please her.

A piece of ________ music will make you happy.

Our       new machines are much cheaper to run.

—— We should adopt _________ methods to deal with some incidents. You know, anything could occur in that situation.—— I got it. Thank you for reminding me.