Choose the right preposition: a) for, during, since.
1.... five years we wrote to one another every month. 2. No buses have been running... the strike began. 3. They stayed here... a month 4. What are you going to do... the holidays? 5. I haven't seen yeu... ages. 6. The windows haven't been cleaned... weeks. 7. I've had this toothache... last Monday. 8. ... my stay in London I visited many museums. 9. I woke up several times... the night. 10. She studied in America... two years. 11. It rained... the night... two or three hours. 12 I've known her... we were students. 13. We've had this car ... two months. 14. He's been here... 10 o'clock. 15. They have lived here ... 1998.​