Question

look at the sentences and complete the rules with on,at or in
1 We use __________ with days
2 We use _________ with times
3 We use _________ with months
4 We use _________ with dates
5 We use _________ with parts of the day (morning,afternoon,evening)
6 We use _________ with night and the weeked
7 We use _________ with years

Answer 1

1. on
2. on (искл.) 
3.in
4.in 
5.in(искл.)
6.at (искл.)
7.in

А ещё предлог перед "the weekend" зависит от изучаемого языка:
on the weekend (брит.)
at the weekend (амер.)