Bài 8: Điền since hoặc for vào chỗ trống thích hợp 1. We have been friends we first met in college. hours. 2. Our son have studied 3. She has worked for that company_ 4. They have lived in that apartment_ 5. We have waited for them 6. 7. I have washed the dishes 8. Our neighbors have sung 9. 6pm. We started dating, she has always made me happy. the beginning of this week. 3 days. nearly a decade. 2016. noon. last Friday, he has been absent
