Wstaw must, can, mustn't lub can’t.

LONDON ZOO: Rules and Regulations |
1. You can feed the monkeys but you ……….feed the lions.
2. You ....... put your hands in the cages. It's dangerous. 
3. You ... always be very careful.
4. You ………..take pictures if you want to. You …….also buy souvenirs from the zoo shop. 
5. You…….. keep the place clean and tidy
6. You………. make noise. It upsets the animals.
7. You……….. step on the grass. Keep to the paths.