4 Underline the correct verb form. 1 His plane took off/ has taken off a few minutes ago. 2 How many emails have you received I have you been receiving today? 3 Look at the oil marks on the floor! You've fixed / 've been fixing your bike in here, haven't you? 4 The CEO has resigned / has been resigned and a new CEO has appointed / has been appointed. 5 I work I've been working here since June. When did you start / have you started? 6 A huge snowstorm has hit / has been hit New York. Over 40 centimetres of snow has fallen / has been falling in the past 12 hours. People have advised / have been advised to stay indoors.