1 on
2on
3 in
4at
5at
6in
7in
1. on Saturdays
2. on Mondays
3. in 1993
4. at the weekend
5. at night
6. in the afternoon
7. in summer
1 on
2on
3 in
4at
5at
6in
7in
1. on Saturdays
2. on Mondays
3. in 1993
4. at the weekend
5. at night
6. in the afternoon
7. in summer