Choose the right forms to complete the sentences.
1 When my telephone (rang/was ringing), I (watched/was watching) my favourite tv programme.
2 My friend and I (danced/were dansing ) while my sister (played/was playing) the piano
3 While Mr Brown (drove/was driving) home, his family (worked/were working) in the garden
4 When the lesson began, all the pupils (sat/were sitting) at their daesks.
5 John (rode/was riding) in the park when he (saw/ was seeing) his friend Sam.