Ответ:
Если я правильно понял то так
1) mustn't
2) mustn't
3) must
4) must
5) mustn't
6) must
Объяснение:
1) You mustn't smoke here.
2) You mustn't walk with your animals here.
3) You must keep your dog on a lead.
4) You must keep left.
5) You mustn't cycle in the gardens.
6) You must clean up after your dog.