'The ghost must have drunk the night.' and '~~ at the night'

'The ghost must have drunk the night.' and '~~ at the night' The ghost must have drunk the whisky.In Mr.Thompson's opinio at night / in the night at night?in the night? at the night & during the night区别? The stars at night the windows of the classroom must be s_____ at night Why the earth have morning and night? It's dark,quiet and quite cold here at night.We must ___ the 是at night还是in the night You must close the windows at night.（改为祈使句） I have a good night,the night.