Complete the sentence using for or since 1. Nobody has seen hin ... last Friday 2. It has been foggy ... some day 3.He has been fishing ... six o'clock 4. They 're been living in France ... eight years 5. The pilots have been on strike ... two months 6. We've had terrible weather ... Saturday 7. I've know Tom ... 1990 8. We have been waiting for the bus ... half an hour 9. She hasn't lost a match ... April 10. Things have changed ... she's become headmaster 11. The police have been looking for him ... a month 12. Our dog has been ill ... two days 13. I've been looking for this book ... a long time 14. I've been working ... I got up 15. The kettle has been boiling ... ten minutes Các bạn giúp mình với mình đnag cần cảm ơn các bạn