Choose the right preposition, "for" or "since".

1. three months

   1.   ?    for
   2.   ?    since

2. a week

   1.   ?    for
   2.   ?    since

3. 1996

   1.   ?    for
   2.   ?    since

4. she was my best friend

   1.   ?    for
   2.   ?    since

5. two years

   1.   ?    for
   2.   ?    since

6. last Friday

   1.   ?    for
   2.   ?    since

7. we moved to Nava

   1.   ?    for
   2.   ?    since

8. Saturday night

   1.   ?    for
   2.   ?    since

9. a day

   1.   ?    for
   2.   ?    since

10. I was 12

    1.   ?    for
    2.   ?    since