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Samir: I'm thankful I'm still alive after that terrible day.
Aysel: What happened? What was the matter?
Samir: Oh, a horrible tornado! You can't imagine how it is dangerous and what the damage it can cause.
Aysel: How did it happen? Has anybody informed you about it before? Was there any warning?
Samir: Oh, no. Usually people have a few minutes warning on the radio or TV.
Aysel: I wonder how tornadoes appear, what deadly results and what shape they have.
Samir: Tornadoes appear as a cloud which moves in circles round a central point. They have the shape of a pipe which are narrow at the bottom and wide at the top.
Aysel: Oh, it's very horrible to hear it. And what about the damage?
Samir: It caused a lot of damages. I don't want to speak about it. Imagine ...
Aysel: Oh, I am sorry.

Куда ставить "to speak" не понимаю. В последнюю реплику Самира не подходит.