вставте предлоги at либо on. даю 25 баллов

1. I get up at seven o'clock or at a quarter past seven.
2. On Sunday I usually get up at nine o'clock or at half past nine. But last Sunday I slept very long and got up only at noon.
3. My birthday is on the ninth of July.
4. The school year begins on the first of September.
5. On the twenty-fifth of December people celebrate Christmas.
6. On Wednesday I usually have a lot of homework.
7. Lev Tolstoy liked to get up at sunrise.
8. Our lessons are usually over at twenty minutes to two.
9. They returned from the wood at sunset.
10. I began writing my composition at seven o'clock and finished only at midnight.

1 at, at. 
2 On, at, at, at
3 on
4 on
5 on
6 on
7 at
8 at
9 at
10 at, at
"on" употребляется для указаний дней и дат - "on Friday", "on 23rd of March"
"at" используем для выражения медли (также времени суток), с наименованиями религиозных праздничков и в выражении "at the weekend"(желая в американском британском будет более употребительным выражение "on the weekend")