Краткое пояснение: Используем between для выбора из двух вариантов, among для группы из трех и более.
- Julia couldn't choose between two dresses.
- We spent last summer among friends in Canada.
- Elephants are among the largest animals in the world.
- The new American singer is popular among young people.
- I don't like Paul very much, but that's between you and me.
- The revolver lay between the two boxes.
- The tents were situated among the high trees.
- There is a bridge between the island and the bank of the river.
- I had English and Geography classes and lunch between them.
- You can choose between cucumber salad and tomato salad.
Ответ: between/among