Răspuns:
1a:
1. Today is Wednesday, so yesterday was Tuesday.
2. The big clock on the wall in my office says it's 5:15 p.m.
3. If you have a meeting every Monday, it's a weekly meeting.
4. There are one hundred years in a century.
5. The book where people write their appointments is called a diary.
6. Autumn is the season when the leaves fall from the trees.
7. People usually give you presents on your birthday.
8. The time between the afternoon and the night is called the evening.
1b:
at: the weekend, half past three, the moment;
in: the afternoon, 2013, January;
on: Friday morning, 15th May, Mondays;
no preposition: every day, last year, tomorrow;
la ex. 2 nu te pot ajuta pentru ca este un ex. de ascultare, dar sper ca te-am ajutat :)