Complete the sentences with the past simple or past continuous form of the verbs given. 1 while i was walking home, i (meet) my friend. 2 my parents (have) an argument when i walked into the room. 3 the students were talking all the time while the teacher (explain) the exercise. 4 what were you doing when you (hear) the news? 5 the students (write) an essay when the teacher told them to stop. 6 my mum (drive) when her mobile phone started to ring. 7 the birds (sing) when we left home this morning.

1 While I was walking home, I met my friend. 2 My parents were having an argument when I walked into the room. 3 The students were talking all the time while the teacher was explaining the exercise. 4 What were you doing when you heard the news? 5 The students were writing an essay when the teacher told them to stop. 6 My mum was driving when her mobile phone started to ring. 7 The birds were singing when we left home this morning. 

1 met
2 had
3 was explaining
4 heard
5 were writing
6 were driving
7 were singing
вроде так, но могу ошибаться