----- Nội dung dịch tự động từ ảnh ----- 3. Complete the sentences by using SINCE/ FOR. 1. I have been a teacher ......... I was 20. 2. Bob has worked in that import-export company ......... ten years. 3. She hasn't had a day off ......... five days. 4. I have studied English ......... summer. 5. Jenny has eaten five hamburgers ......... 9 o'clock. 6. They have all improved in attitude ......... their mother talked to them. 7. My parents have been married ......... five months. 8. I have known my best friend ......... Sunday. 9. The factory has run ......... June. 10. They have traveled in the USA ......... they had money.