Exercise 1. Useprepositions - in, on or at:

1.______ Monday
2. ______ yesterday
3. ______ the morning
4. ______ three o’clock
5. ______ that time
6. ______ midnight
7. ______ winter
8. _____ March
9. _____ noon
10_____breakfast
11 _____ half past seven
12. _____1998