Game - match the connection with these items

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I'm going to name 3 items, and your task is to name what these 3 have in common, BUT it has to be a six letter plural word (meaning it ends in "s"). Here's an example:Railroad, wild animal, music CD Answer= "tracks"Have fun! :) 1.) Trombone, children's playground, laboratory microscope 2.) Hunting dog, compass, scoreboard 3.) Dungeon, jewelry store, sequence 4.) Fish, sheet music, dieters 5.) Municipal parking lot, electric utility, rhythym in verse I will post the answers to these tonight! If you get all 5 right, I'll give you a +!!!:)