1. complete the sentences with at in or on.

1. The results of the election were announced __at__ 11 o'clock.
2. Mobile phones were invented _____ the 2-th century.
2. Our flight is leaving ____ wednesday at 9.30 ____ the evening and arriving ___ 12 o'clock ____ Thursday.
4. We have an exam ____ Monday morning.
5. In most countries, banks and offices are closed ____ Christmas Day and New Year's Day.
6. I hate driving ____ night, getting up early ____ the morning, and working ____ weekends.
7. Steve Jobs was born ____ 1955, and he died ____ 5th October 2011.
8. ____ Easter we went to Portugal and we're going again ____ the summe, probably the last two weeks ____ July.