initial

　　haunt

　　lieutenant

　　crook

　　liar

　　mean to do

　　make one‘s way to

　　trip sb. up

　　in case

　　send sb. doing sth.

　　1.And that was funny， too， because he didn‘t like crime and meant to stop it whenever he could

　　2.For some reason that advertisement haunted Bob Sugg. Here was a mystery he wanted to solve

　　3.A few minutes later， the man in charge of the newspaper files saw an excited boy rush into the room

　　4.The city directory showed no such return address as the advertiser had left

　　5.They must be plain-clothes men， Bob seceded， who would hide until the time was ripe to swoop down on the criminals