EX8. Fill in the blank with "for" or "since". ( Thì hiện tại hoàn thành) 1. It has been raining ……………….. lunchtime. 2. My boss will go away ……………………. the next ten days. 3. I'm 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 …………….. years.