关于since和 for的习题

关于since和 for的习题
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
10._____ lunch time
11.______ she left here
12.He has lived in Nanjing ________ the year before last.
13.I’ve known him __________ we were children.
14.Our teacher has studied Japanese _________ three years.
15.She has been away from the city ___________ about ten years.
16.It’s about ten years __________ she left the city.