translate the sentences into russian paying attention to the modal verb.
1. a farmer must separate a sick animal immediately from the other animals in the herd.
2.a national breeding association is to publish the official record of the pedigree of purebred horses and dogs every year.
3.during the recent decades some species of animals had to move to new places and adapt to new environment conditions.
4. all animals and birds which are imported from foreign countries must be under severe quarantine for some period of time to prevent the introduction of any infections.
5.some symptoms such as high temperature or fever may be noticed even by a non-specialist.