1. ........... a year.
2..................last month.
3. .............twelve years.
4. ...........several years.
5.......................... October
6.......................half an hour.
7...............four o'clock.
8.....................two thousand years.
9............................ 1989.
10..........................two years.
11...................... forty-five minutes.
12.........................June.
13........................last Monday.
14.......................breakfast.
15.........................a month.
