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a) Now that they've seen the place this way they kind of like it.
b) So many windows were broken by the protesters the window-fixing guy hasn't had time to come by yet.
c) The window-fixing guy is on vacation.
d) The building managers are just completely incompetent.
e) They're waiting for all the windows to break so they can replace them all at once.
Feel free to email your answers or any other explanations or guesses.