Решение:
Заполним пропуски в письме, исходя из контекста:
- We went on a school trip to York today.
- Then we went to the castle gift shop.
- After the castle we went for a short walk by the river.
- At lunchtime we had a picnic next to the river.
- Before we left York, we went on a short boat trip.
- I was really pleased with the trip.
Ответ: to; the; for; to; a; with.