1. I’m going to my friend’s house ...ON.... Saturday.
2. I can't wait to open my presents ...ON.... Christmas Day.
3. This beautiful building was built ....IN..... the 16th century.
4. Please, call me ...AT.... lunch time. I'm free then.
5. She was born ....IN.... 1991.
6. I woke up at ....AT... seven o'clock.
7. Classes start ....ON... the 5th of September.
8. We’re going to the cinema ....?ON?/(IN).. Sunday afternoon.
9. The class is ...ON.... Monday ...AT..... ten ..??..... the morning.
10. The course ends ....IN... autumn.
11. We’re leaving early ...IN.... the morning, and we’ll be back late ...IN.... night.
12. I'm going there to meet her ....ON... Monday.
13. Disco was popular ..IN.. the 1970s.
14. I’m normally asleep ..AT.. midnight.
15. I was born ..ON.. the 17th of July.
16. He'll be back ..IN.. ten minutes. Can you wait for him?
17. I'll see you there ..AT.. nine ..OF.. the evening.
18. The company is closed ..IN.. public holidays.