The room is in a terrible mess; it ________have been cleaned.

–Look at that girl! Is it Susan? --No, it _______ be hers. She has gone back to her hometown.

 ---_______I come back before five o’clock? ---No, you ________. But you________ be back later than seven o’clock

 If you want somebody to go window shopping with you, why not try calling Marie? —she ________ be home by now.

They can hardly move at all, _____________?