Choose the correct answer.
1 He's a bit deaf. He ... hear very well.
a) can b) can't c) mustn't
2 He's still very fit. He ... Walk 20 km.
a) has to b) can
C) can't
3 I wear jeans at school every day. We ...
wear a school uniform
a) must b) have to c) don't have to
4 ... study. I've got an exam tomorrow.
a) mustn't b) can't c) have to
5 Turn off your phone. You ... use it here.
a) must b) mustn't
b) can't
c) don't have to​