Exercise 17: Complete the sentences. Put   FOR or SINCE  into each gap  Ex: I have known her FOR three months. 1. It has been raining_____lunchtime. 2. My boss will go away_____the next ten days. 3. I am staying in England_____a year. 4. She has lived in London_____ 1985.  5. Please hurry up! We have been waiting _____an hour. 6. I have known her _____ January. 7. Nam's father has worked in this company _____20 years 8. Have you learned English _____ a long time? 9. I haven't seen Tom _____we left school. 10. The house is very dirty. We haven't cleaned it_____ ages