I thought they were on holiday but

I thought they were on holiday but I _____ wrong, of course.
ought to be
could be
would be
should be
must be

Resultados (Esloveno) 1:

Mislil sem, da so na počitnice, vendar sem ___ narobe, seveda. bi moral biti lahko bi bilo mora biti mora biti

Resultados (Esloveno) 2:

Mislil sem, da so na dopustu, vendar sem _____ narobe, seveda.
Bi moralo biti
bi lahko
bi
morala biti
, mora biti

Resultados (Esloveno) 3:

mislil sem, da so na počitnicah, vendar sem _____ narobe, seveda.bi moral bitilahkobi bilobi moral bitimora biti