Jawaban:

1) Helen was listening to the radio when she heard a strange noise in the garden

2) Melina and Tiara werent having dinner when I came

3) I was reading an article in the newspaper when Judith called

4) What were you watching on TV at 10 last night?

5) When I phoned my friends, they were studying together

6) We werent cycling all day yesterday

7) I was practicing the guitar when he came home

8) Yesterday at six I was preparing dinner

9) He was using the internet at three oclock yesterday

10) Mrs. Brown wasnt walking in the garden when the murder happened