Заполните пропуски.... I open the window?

{"correct_option"=>"Could", "explanation"=>"This is a request for permission. 'Could' is a polite way to ask if it's okay to open the window. 'May' also could be used, but 'could' is more common in this context. 'Must' expresses obligation, it would not work here since the sentence is asking permission, not obligation"}