Choose the correct word. Be careful! Sometimes more than one word is correct.

They're making some changes to my school, and the school rules. They haven't decided anything yet, but they (1) will/might change the school uniform. The colour and the style (2) has to / could change. I hope so! I don't like the one we wear now. Also, lessons (3) could/should change from 45 minutes to 50 minutes. I'm not so keen on that! They (4) may / might build a new sports hall. That would be great, wouldn't it? I think they're going to decide next month, so we (5) must / should know what's happening very soon!​