1. _______ yesterday
    1.   for
    2.   since
  2. _______ three days
    1.   for
    2.   since
  3. _______ a long time
    1.   for
    2.   since
  4. _______ I left school
    1.   for
    2.   since
  5. _______ 50 years
    1.   for
    2.   since
  6. _______ ever
    1.   for
    2.   since
  7. _______ Man first landed on the Moon
    1.   for
    2.   since
  8. _______ a few moments
    1.   for
    2.   since
  9. _______ last summer
    1.   for
    2.   since
  10. _______ five hours
    1.   for
    2.   since