In the following sentences put one of the verbs in brackets into the Past Continuous and the other verb into the Simple Past.

(break, wash-up) While Mary …, she … a cup.
(wait, start) While we … for the train, it … to rain.
(met, study) Jim … to be a doctor, when he … Sally.
(go, meet) I first … Mr Rodrigues when I … round Mexico on a marketing trip.
(interrupt, give) When she … her presentation, someone at the back of the room … to ask a question.
(finalize, ring up) While my PA … arrangements for my trip to Brazil, the clients … to cancel the visit.
(notice, look) The auditors … a large unauthorized withdrawal when they … through the account.
(happen, clean) The worker who died … the chemical tank when the accident … .
(drop, take) One of the removal men … my computer when he … it into my office.
(work, approach) A headhunter … her when she … for ICL.