UNITS 10 - 11 » Стр.39 (E)

E. Complete with must or mustn’t. 1. You mustn’t watch TV all day. It’s bad for your eyes. 2. Ann, you must study hard. The test is difficult. 3. You mustn’t use your mobile phone in the library. 4. You mustn’t take things without asking first. 5. Oh, Mum, must we go now? I’m having a great time!