Помогите вставить предлоги Упражнение 15
1-on 2-on 3-at 4-at 5-at 6-at, in 7-on 8-in 9-in 10-on, in 11 at 12 at 13 at 14 on 15at 16 at 17 on 18 in, in 19 at 20on 21at 22at 23in 24in 25at 26at 27in 28at 29at, in, at, at 30at, on
Спасибо большое