Срочно помогите!!! Вставьте просто слова, а время я уж сам

1. He has been running for two hours, tell him to rest a little. 2. I have been waiting a long time for you, said my friend with a displeased air. 3, They have been making a noise since I came here. 4. How long have you been trying to get in touch with your friend? 5. Your face is dirty with paint. What have you been painting? Have you been considering the house? 6. They have been studying this problem for more than two hours. I ask you to keep to the point. You have been doing for fifteen minutes, but the subject of your report is not clear yet. 8.. He is a rather experienced specialist. He has been working his business for seven years. 9. There is a lot of snow in the street as it has been snowing since yesterday. 10. How long has your brother been working as a doctor? 11. I've got sore feet. We have been walking for six hours already.