1 Underline the correct tense. 1 The plane leaves/has left at four o'clock. We must be at the airport by two o'clock. 2 It gets/is getting colder and colder every day. 3 Have you seen Linda? I have been looking/am looking for her for almost an hour. 4 Sam is a very interesting person. He knows/has known all kinds of unusual facts. 5 First, you are heating/heat the oven to a temperature of 180C. 6 Have you heard the news? They have just elected/ have been electing a new club chairman! 7 Martha is finding/has found a new job. She is starting next week