The sound _____ be coming from the attic; no one is up there.
can’t
It _____ have been a school; there are no classrooms.
might not
couldn’t
must
can’t
The door is locked, so the thief _____ have escaped through it.
couldn’t
The map is very old, so it _____ be accurate.
might not
The house is in ruins; it _____ have been abandoned for decades.
must
The weather _____ change soon; the clouds are building up.
must
couldn’t
can’t
might
The book is very old and valuable; it _____ have belonged to a famous writer.
must
The treasure is very well-hidden; it _____ even exist.
might not
This letter _____ have been written by an important person—it’s poorly written.
might not
The gold necklace _____ be fake—it feels too light to be real.
might
The painting looks authentic; it _____ belong to a famous artist.
must
This strange noise _____ be coming from the wind outside.
might
The lights are on, so someone _____ be at home.
must
The jewels _____ be in this cave—it’s completely empty.
can’t
This building is enormous; it _____ have been used as a palace.
must
This house _____ have belonged to the royal family; it’s huge.
could
might not
couldn’t
must