Đề:.Put "for" or "since" in the brackets tocomplete each sentence..
1. My sister has been a student.............2005.
2. They have only been there..........a few minutes.
3. She' s been away.............five days.
4. We' lived here .................1999. ư
5. We' have' t had any rain...........long time.
6. That building has been there .................the 19th century