Read the sentence pairs. Choose which word or phrase best fits each blank. 1 torpedo / fusee A The workers placed a (1)________________________ on the track to warn the engineer to stop. B If visibility is low, you can use a(2) ________________________ . 2 color light / engine bell A The (3)________________________ indicated that the train needed to stop. B The engineer rang his(4) ________________________ to warn people he was approaching. 3 signals / flags A Torpedoes, fusees, and whistles can all be types of(5)_________________. B (6)________________________ are a pieces of fabric that you can use to signal.