1. Choose the right answer. 1) While I (listened/was listening) to the radio, the telephone (rang/was ringing). 2) He (broke/was breaking) his leg when he (skied/was skiing) in the Alps. 3) They (listened/were listening) to the orchestra when the pianist (became/was becoming) ill. 4) Ann (played/was playing) the piano while Tom (painted/was painting) a picture. 5) We (saw/were seeing) an accident while we (waited/were waiting) for the bus. 6) She (worked/was working) quietly at her desk when suddenly the door (opened/was opening).

Перевод задания: Выберите правильный ответ.

1. While I was listening to the radio, the telephone rang.
   Пока я слушала радио, зазвонил телефон.
2. He broke his leg when he was skiing in the Alps.
   Он сломал ногу, когда катался на лыжах в Альпах.
3. They were listening to the orchestra when the pianist became ill.
   Они слушали оркестр, когда пианисту стало плохо.
4. Ann was playing the piano while Tom was painting a picture.
   Анна играла на пианино, пока Том рисовал картину.
5. We saw an accident while we were waiting for the bus.
   Мы увидели аварию, пока ждали автобус.
6. She was working quietly at her desk when suddenly the door opened.
   Она тихо работала за столом, когда вдруг открылась дверь.

Продолжительное действие в прошлом обычно выражается Past Continuous; краткое событие, которое его прерывает, — Past Simple.