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.