Past%20Simple%20or%20Past%20continuous?

1
Past Simple or Past continuous?

• While I ____________ (watched / was watching)
  television the telephone _________ (rang / was
  ringing)
• While I was watching television the telephone
  rang.
• When I ______________ (walked/was walking) to
  college, I
• (saw/was seeing) my friend.
• When I was walking to college I saw my friend.
• David __________ (fell/was falling) while he
  ____________
• (played/was playing) football.
• David fell while he was playing football.