Time prepositions

An exercise by Konstantinos Papadamos

Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!
   at      in      on   
Fill in: in, on, at

1. the 14th century
2. midnight
3. the first day of the month
4. the summer
5. Christmas Eve
6. 6 o'clock
7. noon
8. the '70s
9. 1945
10. dawn
11. Tuesday
12. the afternoon
13. Friday mornings
14. my birthday
15. Christmastime
16. Christmas day
17. Easter
18. the morning