Matching Pairs Lesson 3 Unit 10Online version Vocabulary expansion. Read each sentence of the talk. What do the underlined expressions mean? by Lisseth Mullo 1 If you ever lose something on a train, on a bus, or anywhere at all, maybe you’ll make an effort to TRACK IT DOWN. 2 Inside I found a rather random collection of artwork—paintings of trees and flowers, PORTRAITS of children, photographs of laughing friends. 3 I just happened to be near an art gallery with some TIME TO KILL. I noticed this interesting black-and-white painting in the window. extra free time A painting, photograph, drawing of a person or group of people. To find something or someone after looking for them in a lot of different places.