用since和for填空
1. ______ two years
2._______ two years ago
3. _______ last month
4.______ 1999
5._______ yesterday
6. _______ 4 o’clock
7. ______ 4 hours
8._______ an hour ago
9. _______ we were children
she left here
11) We have learned five lessons （）the beginning of this te rm.
12) Mrs Liao has been in hospital （）last week.
13) I have stayed at my aunt’s （）two weeks.
14). He has lived in Nanjing ________ the year before last.
15). I’ve known him __________ we were children.
16). Our teacher has studied Japanese _________ three years.
17). She has been away from the city ___________ about ten years.
18). It’s about ten years __________ she left the city.
