Ответ:

Решение:

  1. We had a great skiing holiday on the mountains last month.
  2. On our walk we saw some black cows on a big field.
  3. My uncle has a house by a lake and it's very beautiful there.
  4. My parents would like to live on the coast so they can look at the sea every day.
  5. My friend lives on an island and has to take a boat to go to school every morning.
  6. We can walk along this path and then have a picnic by the river.

Ответ: on, on, by, on, on, by