The survivor

Two planes crashed in the twin towers almost at the same time. It by chance (to happen).
Only rescue teams were allowed on the site, so Corinne for a charity (to work).
She some experience to be on such a gruesome mission (to have).
On the site, in the debris, she meets with a man who has been digging for 20 hours. He thirsty, (to be)
but he doesn't take the bottle immediately. He what is happening to him. (not to realize)
He probably thinks it true (to be) , that he (to be dreaming) and that Corinne (to disappear) or (to turn) into a cloud of dust.
Because of his respirator, Corinne realizes he (also to belong) to a rescue team.