Past Simple and Past Continuous

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I �(hear) a terrible explosion while I �(walk) into my office on the 24^th�floor of the north tower, so I �(look) out of the window. Lots of paper �(fall) from the sky. There was an announcement to evacuate the building, so we �(start) walking down the stairs. As we �(go) down, we �(see) some fire-fighters who �(run) up the stairs. When we �(get) to the ground floor, we �(run) as fast as we could, and after 10 minutes we �(stop) to rest in a small park. That's where we��(stand) when the second tower �(fall) down.

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I �(live) in Edinburgh at the time in a fourth floor flat. It �(be) about two o'clock and I �(sleep). Suddenly I �(wake up). I �(hear) a dog barking loudly outside my window. I �(get up) and �(look) out. I �(be) still half asleep and it �(be) very dark but I could see that someone �(climb) up a ladder towards my bedroom window. I �(be) terrified. I quickly �(phone) the police. I �the situation when I �(hear) a knock on the window. I �(look) up. There �(be) my flatmate at the top of the ladder. He �(wave) and �(shout), "Let me in. I've forgotten my keys!"