Past Simple vs Past Continuous

When I (get) home, I (hear) your phone message.

When I was at WorldDot I (claim) all my travel expenses.

When the computer (crash), I (print) last month's sales figures.

When the plane (take off), I (start) to feel unwell.

We (want) a reliable firm, so we (choose) Samsung.

When I (arrive) at the office, Graham (wait) for me.

They (argue) about the merger when he suddenly (lose) his temper.