Выбрать и вставит (don't might must mustn't)
1)You__wear a hard hat on the building site
2)__go through that door!
3)You__wear safety gloves everywhere in the factory
4) touch that machine! It's very hot.
5)Be careful! High-voltage electricity. You get an electric shock.
6)You use your mobile phone here
1 2 5 must
остальные mustn't