Complete the sentences with must or mustn't. We ... eat inside the gallery! You ... be quiet in the library. We ... feed the animals at the zoo. It's dangerous. Children ... stay close to their parents. We ... take photos. It's bad for the paintings. You ... leave by 6 o'clock or you'll be late.

We mustn't eat inside the gallery! You must be quiet in the library. We mustn't feed the animals at the zoo. It's dangerous. Children must stay close to their parents. We mustn't take photos. It's bad for the paintings. You must leave by 6 o'clock or you'll be late. Объяснение: * must используется, когда речь идет о необходимости или обязанности. * mustn't используется, когда речь идет о запрете.