Complete sentences 1-6 with the words below . blackmailers burglars kidnappers muggers serial killers shoplifters when i was a little kid , i used to belive that . 1 _ were very strong people who picked up shops . 2 _ were people who stole burgers . 3 _ were people who hit you on the head with a mug . 4 _ were people who sent black envelopes to people . 5 _ were murderers who put polson in breakfast cereals . 6 _ were people who would catch kids and force them to take a nap /