2. 1. Jack ........... be at home. His jacket is still
here.
CAN´TCAN´T
a) might b) can't c) mustn´t
2. I .......... still have your book, but I'm not
certain.
MIGHTMIGHT
a) might b) must c) can't

3. 3. This ....... be the right answer. The others
are definitely wrong.
MUSTMUST
a) can't b) must c) could
4. That ............. be Maria. I'm sure she's got
blond hair, not dark.
CCAN´T
a) may b) might c) can't

4. 5. I'm not sure at all but the painting .......... be
an original.
MIGHTMIGHT
a) might b) must c) can't
6. He's been working hard so he ........... be
tired.
MUSTMUST
a) may b) can't c) must