Choose the correct answer.
1 He's a bit deaf. He ... hear very well.a) can b) can't c) mustn't2 He's still very fit. He ... Walk 20 km.a) has to b) canC) can't3 I wear jeans at school every day. We ...wear a school uniforma) must b) have to c) don't have to4 ... study. I've got an exam tomorrow.a) mustn't b) can't c) have to5 Turn off your phone. You ... use it here.a) must b) mustn'tb) can'tc) don't have to