4 Choose the correct option: a, b or c.
1-You use your mobile in the library.
a) have to b) mustn't c) don't have to
2 We wear a school uniform.
a) must to b) has to c) don't have to
3 You have a shower before using the pool.
a) mustn't to b) have to c) must to
4 You_smoke here - it's illegal.
a) must b) don't have to c) mustn't
5 You be 18 to drink alcohol in Britain.
a) must b) mustn't c) don't have
6 I leave the class now?
a) Can't b) Can to c) May
7
you help me with the shopping?
a) May not b) Can't c) Can