Fill in the blanks with the prepositions of time in, on, at where necessary.
I. I usually finish work early ___ Friday. I don't

work the weekend. 2. Let's meet ___five___ Sunday,

July 14. 3.I am busy ___ the moment. Come ___ ten

minutes' time, please. 4. There was a boat race in

Southampton Easter Day. A lot of people usually

come there ___ Easter to see the race. 5. Can you imagine

what the world will be ___ the year 2100? 6. When will

you have your holiday, ___ winter or ___ summer? — I'll

have it late August. 7. We started off ___midnight

and reached the place of destination ___ twelve hours

___noon. 8.I was in France in 1997.___ that time I was

working as a waiter in a small cafe. 9.___the age of

sixteen he left his parents' house. 10.___her wedding

day she got up ___ dawn. 11. You must come and have

tea with us next Thursday. Are you free ___ Thursday?

12.I received a lot of presents ___ my birthday.

13. Leonardo da Vinci lived and worked ___ the Middle

Ages. 14. every day he got up early ___ the morning

and went to bed late night. 15. the 19th century

+many people died of cholera and smallpox.