Bài 7:Điền “since” hoặc “for” vào chỗ trống 1. She has been in Vung Tau ................ January. 2.Ha and Nam have seen this film .............. 7 o’clock. 3. I have sent her 3 letters ................. last week. 4. My sister has worked at that hospital .................. 5 years. 5. I have known her ................ we were at elementary school. 6. Nam has become a footballer ................. 3 years. 7. She’s been in London ................ Monday. 8. Mike has lived in Hanoi ................ four years. 9. I have written to her ................... Christmas. 10. We’ve not seen her ................... last month